Question 1

Which of the following statements about enantiomers is correct?

Accepted Answer

Enantiomers are non-superimposable mirror images.

Question 2

In a nucleophilic substitution reaction, what is the key difference between $S_N1$ and $S_N2$ mechanisms?

Accepted Answer

$S_N2$ is concerted; $S_N1$ is stepwise.

Question 3

Which of the following substituents at the $eta$-carbon can increase the rate of $S_N2$ reactions?

Accepted Answer

Electron-withdrawing groups

Question 4

What is the major product of an $E2$ elimination of 2-bromopentane with a strong base?

Accepted Answer

Trans-2-pentene

Question 5

Which reagent is commonly used to convert alcohols into alkyl chlorides?

Accepted Answer

Thionyl chloride ($SOCl_2$)

Question 6

Which of the following is true about diastereomers?

Accepted Answer

They have different configurations at one or more (but not all) chiral centers.

Question 7

What is a racemic mixture?

Accepted Answer

A mixture of equal amounts of two enantiomers, showing no optical activity.

Question 8

When naming alcohols, what suffix is used to indicate the presence of the alcohol group?

Accepted Answer

-ol

Question 9

Which of the following solvents is best for $S_N2$ reactions?

Accepted Answer

Polar aprotic

Question 10

Which of the following structures contains the amine functional group?

Accepted Answer

A structure with $-NH_2$ attached to a carbon chain

Question 11

Which of the following substituents is an ortho/para director in electrophilic aromatic substitution (EAS) reactions?

Accepted Answer

$-OH$

Question 12

What is the conjugate base of an alcohol called?

Accepted Answer

Alkoxide ion

Question 13

Which of the following is the expected major product when 2-bromopentane undergoes $E2$ elimination with a bulky base?

Accepted Answer

1-pentene

Question 14

Which of the following is a common activating group for EAS reactions?

Accepted Answer

$-NH_2$

Question 15

Which of the following best describes the relationship between cis-2-butene and trans-2-butene?

Accepted Answer

Diastereomers

Question 16

Which of the following reagents can be used to reduce a ketone to a secondary alcohol?

Accepted Answer

Lithium aluminum hydride ($LiAlH_4$)

Question 17

Which of the following is the correct IUPAC name for the compound with the structure $CH_3CH_2CH_2Br$?

Accepted Answer

1-bromopropane

Question 18

Which of the following is the correct order of reactivity for alkyl halides in $S_N2$ reactions?

Accepted Answer

Methyl > primary > secondary > tertiary

Question 19

Which of the following statements is true regarding the stability of carbocations?

Accepted Answer

Tertiary carbocations are more stable than secondary carbocations.

Question 20

Which of the following is the correct product when benzene reacts with bromine in the presence of $FeBr_3$?

Accepted Answer

Bromobenzene

Organic Chemistry Final Exam Study Guide: Key Concepts and Mechanisms

Study Guide - Practice Questions