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Pre-Medical Chemistry Review Questions - 3751 Verified Questions

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Pre-Medical Chemistry Review

Questions

Course Introduction

Pre-Medical Chemistry is designed to provide students with a foundational understanding of chemical principles essential for further studies in health sciences and medical fields. The course covers core topics such as atomic and molecular structure, chemical bonding, stoichiometry, thermodynamics, chemical equilibrium, acids and bases, and basic organic chemistry. Emphasis is placed on the application of these concepts to biological systems and real-world medical scenarios, preparing students for advanced coursework in biochemistry, pharmacology, and related areas. Laboratory exercises reinforce theoretical knowledge through hands-on experimentation, data analysis, and critical thinking, fostering key skills necessary for success in medical and scientific careers.

Recommended Textbook

Organic Chemistry 3rd Edition by David R. Klein

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Chapter 1: A Review of General Chemistry: Electrons, Bonds, and

Molecular Properties

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Sample Questions

Q1) In quantum mechanics a node (nodal surface or plane) is ________ .

A) location where \(\varPsi\) is negative

B) location where \(\varPsi\) is positive

C) location where \(\varPsi\) <sup>2</sup> is positive

D) location where \(\varPsi\) <sup>2</sup> is negative

E) location where \(\varPsi\) is zero

Answer: E

Q2) The molecular geometry of carbon tetrachloride, CCl<sub>4</sub>, is _________ .

A) tetrahedral

B) trigonal planar

C) trigonal pyramidal

D) square planar

E) linear

Answer: A

Q3) Draw three constitutional isomers that have molecular formula C<sub>4</sub>H<sub>8</sub>BrCl

Answer: 11ea894b_ac39_7393_bba7_5d99a39990d6_TB4454_00_TB4454_00 There are additional correct answers.

Q4) Draw the Lewis structure for NH<sub>2</sub>CN including formal charges, if any?

Answer: 11ea894b_ac3f_17fd_bba7_bb70517ce0dc_TB4454_00_TB4454_00

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Chapter 2: Molecular Representations

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Sample Questions

Q1) Draw a bond-line structure for each constitutional isomer with molecular formula C<sub>4</sub>H<sub>11</sub>N.

Answer: 11ea894b_ac5a_b6ed_bba7_e335e41aa83f_TB4454_00_TB4454_00 11ea894b_ac5a_b6ee_bba7_09cf9b264767_TB4454_00_TB4454_00

Q2) The spreading of positive or negative charge over two or more atoms in a compound is called_______.

A) isomerism

B) delocalization

C) stereoisomerism

D) localization

E) None of these

Answer: B

Q3) Draw the Lewis structure for (CH<sub>3</sub>)<sub>3</sub>C(CH<sub>2</sub>)<sub>2</sub>OCH(CH<sub>2</sub> CH<sub>3</sub>)<sub>2</sub>.

Answer: 11ea894b_ac55_d4ca_bba7_bfadc8d364ce_TB4454_00_TB4454_00

Q4) Draw a bond-line structure for CH<sub>3</sub>C C(CH<sub>2</sub>)<sub>3</sub>C(CH<sub>3</sub>)<sub>2</sub>C H<sub>2</sub>OCH<sub>3</sub>.

Answer: 11ea894b_ac59_f396_bba7_81bf1cc783ac_TB4454_00_TB4454_00

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Chapter 3: Acids and Bases

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Sample Questions

Q1) Which of the following is not a Brønsted -Lowry base?

A) CH<sub>3</sub>OH

B) CH<sub>3</sub>OCH<sub>3</sub>

C) CH<sub>3</sub>NH<sub>2</sub>

D) CH<sub>3</sub>CH<sub>3</sub>

E) None of these

Answer: D

Q2) The tail of the curved arrow must start at ____ electron density and the head must end at ____ electron density.

A) low, high

B) high, high

C) low, low

D) high, low

Answer: D

Q3) What is the strongest base that can be used with water as a solvent?

Answer: hydroxide

Q4) Draw the conjugate acid of CH<sub>3</sub>OCH<sub>3</sub>

Answer: 11ea894b_ac6a_bc2d_bba7_b95ff4ea07c8_TB4454_00_TB4454_00

Q5) Draw the conjugate acid of CH<sub>3</sub>CH<sub>2</sub>OH.

Answer: 11ea894b_ac6a_bc2c_bba7_eba66b89b0d7_TB4454_00_TB4454_00

Page 5

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Chapter 4: Alkanes and Cycloalkanes

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Sample Questions

Q1) Draw a chair conformation of ethylcyclohexane with the ethyl group axial.

Q2) Identify the size of the hydrocarbon that is used in jet fuel.

A) C<sub>1</sub> - C<sub>4</sub>

B) C<sub>5</sub> - C<sub>12</sub>

C) C<sub>12</sub> - C<sub>18</sub>

D) C<sub>12</sub> and higher

Q3) Identify the size of the hydrocarbon that is used in gasoline.

A) C<sub>1</sub> - C<sub>4</sub>

B) C<sub>5</sub> - C<sub>12</sub>

C) C<sub>12</sub> - C<sub>18</sub>

D) C<sub>12</sub> and higher

Q4) Draw the lowest energy chair conformer of the most stable isomer of 4-isopropyl-1,2-dimethylcyclohexane.

Q5) What is the structure of an isopropyl group?

Q6) Draw a chair conformation of methylcyclohexane.

Q7) Identify the size of the hydrocarbon that is used in natural gas.

A) C<sub>1</sub> - C<sub>4</sub>

B) C<sub>5</sub> - C<sub>12</sub>

C) C<sub>12</sub> - C<sub>18</sub>

D) C<sub>12</sub> and higher

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Chapter 5: Stereoisomerism

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Sample Questions

Q1) Rank the following from highest to lowest priority according to the Cahn-Ingold-Prelog system.

I. -F II. -H III. -OH IV. -SH

Q2) Rank the following from highest to lowest priority according to the Cahn-Ingold-Prelog system.

I. -CH<sub>3</sub> II. -CN III. -CH<sub>2</sub>OH IV. -Br

Q3) Draw all the isomers with molecular formula C<sub>4</sub>H<sub>8</sub>.

Q4) If a sample of carvone gives a specific rotation of 60 and the specific rotation of (R)-carvone is 61, does the unknown sample primarily have the R or S absolute configuration?

Q5) What is the percentage of the R enantiomer in a sample of carvone that has a specific rotation of 30, given that the specific rotation of (R)-carvone is 61?

A) 26%

B) 51%

C) 49%

D) 75%

Q6) What is the percentage of the R enantiomer in a sample of limonene that has a specific rotation of 38, given that the specific rotation of (S)-limonene is 116?

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Chapter 6: Chemical Reactivity and Mechanisms

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Sample Questions

Q1) What is the effect of a catalyst on a reaction?

A) It increases the rate.

B) It decreases the entropy.

C) It changes the equilibrium.

D) It makes the products more stable.

Q2) Predict the sign of G for an endothermic reaction with an increase in entropy.

A) positive

B) negative

C) no change

D) cannot predict without additional information

Q3) Draw an energy diagram for a concerted exothermic reaction.

Q4) Predict the sign of G for an exothermic reaction with an increase in entropy.

A) positive

B) negative

C) no change

D) cannot predict without additional information

Q5) Does a reaction with a value of 0 for G favor reactants or products?

Q6) Does a reaction with a H of 20 kJ/mol and a S of 10 J/mol·K at 298 K favor reactants or products?

Q7) Draw an energy diagram for an exothermic three-step reaction.

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Chapter 7: Alkyl Halides: Nucleophilic Substitution and Elimination Reactions

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Sample Questions

Q1) What set of reaction conditions would favor an S<sub>N</sub>1 reaction on 2-bromo-3-methylbutane?

A) weak nucleophile in a protic solvent

B) weak nucleophile in an aprotic solvent

C) strong nucleophile in a protic solvent

D) strong nucleophile in an aprotic solvent

Q2) Which of the following is a weakest nucleophile in a polar protic solvent?

A) F<sup>-</sup>

B) Cl<sup>-</sup>

C) Br<sup>-</sup>

D) I<sup>-</sup>

E) All of these

Q3) Draw the transition state for the following reaction. (S)-1-iodo-3-methylpentane + NaSCH<sub>3</sub>

Q4) Draw the isomer of 2-bromo-1,1,3-trimethylcyclohexane that would be more reactive in an E2 elimination.

Q5) Which pattern of arrow pushing is associated with the first step in any dehydration reaction?

Q7) Draw the Z isomer of 3,4-dimethyl-3-hexene. Page 9

Q6) Provide the structure for 1-chloro-4-isopropylheptane.

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Page 10

Chapter 8: Addition Reactions of Alkenes

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Sample Questions

Q1) What is the expected major product upon reaction of 1-pentene with Cl<sub>2</sub>?

A) 1-chloropentane

B) 2-chloropentane

C) 1,1-dichloropentane

D) 2,2-dichloropentane

E) 1,2-dichloropentane

Q2) Addition reactions of alkenes are characterized by _________.

A) formation of a bond

B) addition of two groups across a double bond

C) breaking of a bond

D) A and B

E) B and C

Q3) Identify the expected first intermediate formed during a halohydrin reaction.

A) a halonium ion.

B) the most stable carbocation with OH on the adjacent carbon.

C) the most stable carbocation with X on the adjacent carbon.

D) a cyclic oxonium ion.

E) the most stable carbanion.

Q4) The alkene precursor to ethanol is __________.

Page 11

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Chapter 9: Alkynes

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Sample Questions

Q1) Which of the alkynes below, after undergoing an acid-catalyzed hydration, would be expected to produce two different ketones in nearly equivalent yields?

A) 1-hexyne

B) 2-hexyne

C) 3-hexyne

D) 3-methyl-1-pentyne

E) 4-methyl-1-pentyne

Q2) Provide the IUPAC name for BrCH<sub>2</sub>CH<sub>2</sub>C CCH<sub>2</sub>CH<sub>3</sub>.

A) 1-bromo-3-hexyne

B) 6-bromo-3-hexyne

C) 1-bromo-2-hexyne

D) 6-bromo-4-hexyne

E) 1-bromo-4-hexyne

Q3) What is the expected major organic product from the treatment of 4-methyl-2-pentyne with excess hydrogen in the presence of a platinum catalyst?

Q4) What is the expected major organic product from the treatment of 4-methyl-2-pentyne with hydrogen in the presence of Lindlar's catalyst?

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Page 12

Chapter 10: Radical Reactions

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Sample Questions

Q1) Cyclic compound A has molecular formula C<sub>5</sub>H<sub>10</sub> and undergoes monochlorination to yield exactly three different constitutional isomers. Identify compound A and show the monochlorination products.

Q2) Propose a synthesis of 4-penten-2-ol from propene.

Q3) Both compounds A and B have molecular formula C<sub>6</sub>H<sub>14</sub>. Monochlorination of compound A results in the formation of two constitutional isomers. Monochlorination of compound B results in the formation of four constitutional isomers. Identify compounds A and B, and show the products of each monochlorination.

Q4) Compound A has molecular formula C<sub>6</sub>H<sub>12</sub>. Upon treatment with NBS and irradiation with UV light, exactly two compounds (including stereoisomers), are formed. Suggest a possible structure for compoundA.

Q5) Upon treatment with NBS and irradiation with UV light, 1-ethyl-4-methylbenzene produces exactly three monobrominated compounds (including stereoisomers). Draw the products of this reaction.

Q6) Give the arrows to show the propagation steps for the autooxidation of diethyl ether.

Q7) How many constitutional isomers are possible if propane is dichlorinated? Draw them.

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Chapter 11: Synthesis

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Sample Questions

Q1) Taxol is found in the ______ tree

A)tea

B)Eucalyptus

C)sausage fruit

D)Baobab

E)Pacific yew

Q2) Starting with a primary alkyl bromide, which of the following results in an overall increase in the length of the carbon skeleton by one carbon?

A) substitute bromide with acetylide, then cleave the triple bond

B) substitute bromide with acetylide, then reduce the alkyne to an alkene

C) substitute bromide with methoxide

D) eliminate hydrogen bromide to produce an alkene

Q3) Devise a method of converting 4-methyl-1-pentene into 3-methylbutanoic acid.

Q4) Identify the changes that must occur in converting cis-2-butene into 2-butanol.

A) only the identity of the functional group(s) must change

B) only the carbon skeleton must change

C) only the location of the functional group(s) must change

D) only the identity and location of the functional group(s) must change

E) both the carbon skeleton and the identity of the functional group(s) must change

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Chapter 12: Alcohols and Phenols

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Sample Questions

Q1) Identify the alcohol in alcoholic drinks.

A) methanol

B) 2-propanol

C) ethanol

D) 1-butanol

E) 1-propanol

Q2) Provide the structure for (2R,3S) -2-bromo-1,3-pentanediol.

Q3) Identify wood alcohol.

A) methanol

B) 2-propanol

C) ethanol

D) 1-butanol

E) 1-propanol

Q4) Provide the reagent(s) necessary to prepare 1-isopropylcyclopentanol using a Grignard reaction.

Q5) Provide the structure for 5-chloro-2-propyl-1-heptanol.

Q6) Provide the structure for 6-sec-butyl-7,7-dimethyl-4-decanol.

Q7) Nature's catalysts are called ________.

Page 15

Q8) Provide the reagent(s) necessary to convert cyclohexanol to cyclohexane..

Q9) Give the structure for (E)-4,5,5-trimethyl-3-hepten-1-ol.

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Chapter 13: Ethers and Epoxides; Thiols and Sulfides

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Sample Questions

Q1) Provide the structure for oxetane.

Q2) Ethers with larger alkyl groups have higher boiling points due to ___________ .

A) dipole-dipole interactions

B) ion-dipole interactions

C) ion-ion interactions

D) London dispersion forces

E) hydrogen bonding

Q3) Identify the conditions of oxymercuration-demercuration.

A) anti-Markovnikov, rearrangement possible

B) anti-Markovnikov, no rearrangement possible

C) Markovnikov, rearrangement possible

D) Markovnikov, no rearrangement possible

Q4) Explain why long-term storage of ethers can be dangerous.

Q5) What type of molecular interactions do ethers have?

A) dipole-dipole interactions

B) ion-dipole interactions

C) ion-ion interactions

D) London dispersion forces

E) hydrogen bonding

Q6) Provide the structure for (R)-2,2,3-trimethyl-3-phenyloxirane.

Page 17

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Chapter 14: Infrared Spectroscopy and Mass Spectrometry

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Sample Questions

Q1) Which of the following will produce (M+2)<sup>+</sup> peak one third the intensity of M<sup>+</sup> peak?

A) nitrogen

B) chlorine

C) bromine

D) oxygen

E) B and C

Q2) A stationary phase separates the components of a mixture based on their _____________ and __________ .

A) boiling points, their affinity for the stationary phase

B) melting points, their repulsion for the stationary phase

C) molecular weights, melting points

D) solubility in water, in methanol

E) heat of vaporization, heat of sublimation

Q3) Provide the structures of the fragments that result when the molecular ion of 2-heptanone undergoes fragmentation via McLafferty rearrangement.

Q4) Propose possible structure(s) for a compound with molecular formula C<sub>4</sub>H<sub>7</sub>N that shows absorption at 2250 cm<sup>-1</sup> in its IR spectrum.

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Chapter 15: Nuclear Magnetic Resonance Spectroscopy

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Sample Questions

Q1) Predict the multiplicity of each signal in the expected <sup>1</sup>H NMR spectrum of 2,3-dimethyl-2-pentanol.

Q2) In an NMR spectrometer, the receiver coil records a complex signal, called a ________________, which is converted into a spectrum via a mathematical technique called a ____________________.

Q3) Propose a structure for a compound, with molecular formula C<sub>10</sub>H<sub>12</sub>O, that fits the following spectroscopic data: IR: 1680 cm<sup>-1</sup>

<sup>1</sup>H NMR: 1.0 \(\delta\) (triplet, 3H), 1.5 \(\delta\) (sextet, 2H), 2.6 \(\delta\) (triplet, 2H), 7.4 \(\delta\) (triplet, 2H), 7.5 \(\delta\) (triplet, 1H), 7.9 \(\delta\) (doublet, 2H)

Q4) _______ protons experience a net magnetic field strength that is smaller than the applied magnetic field.

A) Deshielded

B) Shielded

C) Paramagnetic

D) Diamagnetic

E) none of these

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Chapter 16: Conjugated Pi Systems and Pericyclic Reactions

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Sample Questions

Q1) Identify the product of a thermodynamically-controlled reaction.

A) the most stable product

B) the product whose formation requires the smallest free energy of activation

C) the product that can be formed in the fewest steps

D) the product that is formed at the fastest rate

E) none of these

Q2) Which is the most energetically favorable UV transition for 1,3-butadiene?

A) (n \(\to\) \(\sigma\)*)

B) (n \(\to\) \(\pi\)*)

C) (\(\pi\)<sub>2 </sub> \(\to\) \(\pi\)<sub>3</sub>*)

D) (\(\sigma\) \(\to\) \(\sigma\)*)

E)(\(\pi\)<sub>1 </sub> \(\to\) \(\pi\)<sub>4</sub>*)

Q3) How many electrons does the LUMO of 2,4-hexadiene have in its ground state?

A) 1

B) 2

C) 3

D) 4

E) 0

Q4) The reaction of 1,3-butadiene with hydrogen halide at 40°C will undergo _____ -addition under ____________ control.

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Chapter 17: Aromatic Compounds

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Sample Questions

Q1) For a compound to be aromatic, it must have a planar cyclic conjugated \(\pi\) system along with an _____ number of electron pairs.

A) even

B) odd

C) either even or odd

D) none of these

Q2) Identify the number of \(\pi\) electrons present in an aromatic compound.

A) 4n + 2

B) 2n + 2

C) 4n

D) 2n

E) 3n

Q3) Provide a structure for the compound with molecular formula

C<sub>9</sub>H<sub>9</sub>ClO and with the following spectroscopic data.

IR: 1680 cm<sup> 1</sup>

<sup>1</sup>H NMR: 3.5 \(\delta\) (triplet, 2H), 4.0 \(\delta\) (triplet, 2H), 7.4 \(\delta\) (triplet, 2H), 7.6 \(\delta\) (triplet, 1H), 7.9 \(\delta\) (doublet, 2H)

Q4) Identify the scientist credited with proposing the structure of benzene.

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Page 21

Chapter 18: Aromatic Substitution Reactions

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Sample Questions

Q1) Identify the mechanism by which benzene reacts with bromine.

Q2) List the three steps involved in an electrophilic aromatic substitution reaction.

Q3) Which of the following substituents will not direct the incoming group to the ortho/para position during electrophilic aromatic substitution?

A) -CH<sub>2</sub>CH<sub>3</sub>

B) -CF<sub>3</sub>

C) -OCH<sub>3</sub>

D) -NHCH<sub>3</sub>

E) -Br

Q4) Identify the product from the reaction of nitrobenzene with iron and hydrochloric acid, followed with base.

A) nitrobenzene

B) benzene

C) aniline

D) 1,3-dinitrobenzene

E) 1,4-dinitrobenzene

Q5) A halogen ___________ the benzene ring; the ring is __________ reactive than benzene.

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Chapter 19: Aldehydes and Ketones

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Q1) What is the correct order of the migration rate for the following groups in the Baeyer-Villiger oxidation reaction?

A) phenyl > methyl > t-butyl > H

B) phenyl > t-butyl > methyl > H

C) H > phenyl > methyl > t-butyl

D) H > t-butyl > phenyl > methyl

E) methyl > t-butyl > phenyl > H

Q2) Suggest a stepwise synthesis for 5-methyl-2-hexanone from 3-methyl-1-bromobutane.

Q3) Name the aldehyde or ketone that is found in nail polish remover.

A) ethanol

B) 2-butanone

C) acetone

D) formaldehyde

E) diethyl ether

Q4) Provide the structure for m-nitroacetophenone.

Q5) Suggest a stepwise synthesis for 4-methyl-1-pentanamine from 3-methyl-1-butanol.

Q6) Suggest a stepwise synthesis for pentanal from butanal.

Q8) Provide the structure for 4-methylbenzaldehyde. Page 23

Q7) Suggest a stepwise synthesis for 1-pentanol from butanal.

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Page 24

Chapter 20: Carboxylic Acids and Their Derivatives

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Sample Questions

Q1) Provide the structure for benzoic ethanoic anhydride.

Q2) Give the IUPAC name for malonic acid.

A) ethanedioic acid

B) propanedioic acid

C) butanedioic acid

D) pentanedioic acid

E) benzoic acid

Q3) Provide the structure for benzoyl chloride.

Q4) Which one of the following compounds has the highest boiling point?

A) butanoic acid

B) 1-butanol

C) 2-butanone

D) methoxyethane

E) butanal

Q5) Which one of the following is the strongest acid?

A) 2,2-dichlorobutanoic acid

B) 2,3-dichlorobutanoic acid

C) 3,3-dichlorobutanoic acid

D) 3,4-dichlorobutanoic acid

E) 4,4-dichlorobutanoic acid

Page 25

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Chapter 21: Alpha Carbon Chemistry: Enols and Enolates

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Sample Questions

Q1) How many gamma hydrogens are in 2-pentanone?

A) 1

B) 2

C) 3

D) 4

E) 5

Q2) Which one of the following is a major product in a Claisen condensation?

A)(\(\alpha\)-keto ester)

B) (\(\beta\)-keto ester)

C) (\(\beta\)-hydroxy ester)

D)( \(\gamma\)-hydroxyester)

E) (\(\beta\)-diketone)

Q3) Provide the structure of the enol when 3,3,6-trimethyl-4-heptanone is treated with acid.

Q4) Which of the following aldehydes and ketones will give a positive haloform test?

A) 3-heptanone

B) 4-decanone

C) acetone

D) 3-pentanone

E) 3-hexanone

Page 26

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Chapter 22: Amines

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Sample Questions

Q1) Provide the reagents necessary to convert (S)-3-methyl-3-phenylpentanoic acid to (S)-3-methyl-3-phenylpentanamine.

Q2) Which of the following is a tertiary amine?

A) CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>NH<sub>2</sub> B)

CH<sub>3</sub>CH<sub>2</sub>NHCH<sub>2</sub>CH(CH<sub>3</sub>)<sub>2</sub> C)

(CH<sub>3</sub>CH<sub>2</sub>)<sub>2</sub>NCH<sub>2</sub>CH(CH<sub>3</sub> )<sub>2</sub>

D) (CH<sub>3</sub>CH<sub>2</sub>)<sub>4</sub>N<sup>+ </sup>OH<sup>-</sup> E) (CH<sub>3</sub>CH<sub>2</sub>)<sub>3</sub>CNH<sub>2</sub>

Q3) Which of the following is a primary amine?

A) CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>NH<sub>2</sub> B)

CH<sub>3</sub>CH<sub>2</sub>NHCH<sub>2</sub>CH(CH<sub>3</sub>)<sub>2</sub> C)

(CH<sub>3</sub>CH<sub>2</sub>)<sub>2</sub>NCH<sub>2</sub>CH(CH<sub>3</sub> )<sub>2</sub>

D) (CH<sub>3</sub>CH<sub>2</sub>)<sub>4</sub>N<sup>+ </sup>OH<sup>-</sup> E) (CH<sub>3</sub>CH<sub>2</sub>)<sub>3</sub>N

Q4) Predict the major product when p-toluidine reacts with sodium nitrite and hydrochloric acid at < 5°C followed by o-ethylphenol?

2

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Chapter 23: Introduction to Organometallic Compounds

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Sample Questions

Q1) Which of the following is the most polar bond?

A) C-B

B) C-Pd

C) C-Zn

D) C-Pt

Q2) Which of the following statements is false regarding the preparation of organolithium compounds?

A) Organolithium compounds can be made from alkyl halides (R-X).

B) Organolithium compounds can be made from aryl halides (Ar-X).

C) Vinyl halides cannot be used to form vinyl lithium reagents.

D) Lithium halides are byproducts of the reaction of lithium metal with alkyl halides.

E) It is necessary to use two equivalents of lithium metal.

Q3) Identify the product when ethylene oxide reacts with one equivalent of a Grignard reagent.

A) primary alcohol

B) secondary alcohol

C) tertiary alcohol

D) carboxylic acid

E) ketone

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Chapter 24: Carbohydrates

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Sample Questions

Q1) Six-membered cyclic hemiacetal carbohydrates are called ________.

A) furanose

B) pyranose

C) ketopentose

D) aldopentose

E) none of these

Q2) Predict the product(s) when maltose is treated with CH<sub>3</sub>OH/HCl.

Q3) Which of the following aldohexoses is dextrorotatory?

A) D-glucose

B) D-galactose

C) D-gulose

D) D-mannose

E) cannot predict

Q4) Simple sugars are called_______ , a term that derives from the Latin word for sugar, saccharum.

A) monosaccharides

B) disaccharides

C) polysaccharides

D) saccharides

E) all of these

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Chapter 25: Amino Acids, Peptides, and Proteins

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Sample Questions

Q1) Which of the following tetrapeptides is not cleaved by trypsin?

A) Gly-Lys-Cys-Phe

B) Cys-Ala-Arg-Ser

C) Gly-Ser-Ile-Lys

D) Ala-Lys-Tyr-Arg

E) Lys-Met-Pro-Ala

Q2) A peptide with 12 amino acid residues produced the following fragments when treated with trypsin and chymotrypsin. Edman degradation of this peptide produced the phenylthiohydantoin derivative of glycine. What is the structure of this peptide?

Trypsin: Gly-Leu-Phe-Arg, Cys-Tyr-Ile-Gly, Val-Trp-Ser-Lys

Chymotrypsin: Gly-Leu-Phe, Ser-Lys-Cys-Tyr, Ile-Gly, Arg-Val-Trp,

Q3) List the reason why the s-trans conformation of a peptide bond is more stable than the s-cis conformation.

A) there is a restricted rotation around the peptide bond

B) rotation is allowed around the peptide bond

C) it has reduced steric hindrance

D) none of these

Q4) Draw the Fischer projection for L-aspartic acid and assign the configuration (R/S) at the chirality center.

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Chapter 26: Lipids

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Sample Questions

Q1) Identify the fuel that is produced when vegetable oil undergoes transesterification.

A) gasoline

B) diesel

C) biodiesel

D) kerosene

E) natural gas

Q2) Which of the following hormones is (are) sex hormones in males?

A) testosterone

B) androsterone

C) cortisone

D) estradiol

E) both A and B

Q3) The reaction of triglycerides with a base is a(n) ________ reaction.

A) esterification

B) transesterification

C) saponification

D) autooxidation

E) oxidation

Q4) ______lipids do not undergo hydrolysis in the presence of aqueous acid or base.

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Chapter 27: Synthetic Polymers

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Sample Questions

Q1) Polymers are comprised of repeating units that are formed by joining _______.

A) tetramers

B) monomers

C) dimers

D) trimers

E) none of these

Q2) Which of the following monomer(s) would undergo anionic polymerization?

A) vinyl acetate

B) acrylonitrile

C) isobutylene

D) vinylidene chloride

E) all of these

Q3) Polymerization of ethylene in the presence of a Ziegler-Natta catalyst results in _______.

A) LDPE

B) MDPE

C) HDPE

D) B and C

E) none of these

Q4) Draw a possible segment of atactic polyacrylonitrile.

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