Question 1

Which of the following best describes the relationship between two molecules that have the same molecular formula but differ in the connectivity of their atoms?

Accepted Answer

They are constitutional (structural) isomers.

Question 2

A molecule contains a carbon atom bonded to four different groups. What is this carbon atom called, and what property does it impart to the molecule?

Accepted Answer

A chiral center; it makes the molecule optically active.

Question 3

Which of the following pairs are NOT isomers?

Accepted Answer

Molecules with different molecular formulas.

Question 4

Which functional group is present in both amides and esters?

Accepted Answer

A carbonyl group ($$\mathrm{C=O})$$

Question 5

Given two molecules with the same molecular formula and atom connectivity, but one is the mirror image of the other and they are not superimposable, what is the relationship between them?

Accepted Answer

They are enantiomers.

Question 6

Which of the following is a correct molecular formula for a molecule containing an aromatic ring, a tertiary amine, and no other functional groups?

Accepted Answer

$$\mathrm{C_6H_5N(CH_3$)_2}$$

Question 7

Which of the following best describes a conformational isomer?

Accepted Answer

Molecules with the same connectivity but different spatial arrangement due to rotation around a single bond.

Question 8

A molecule contains both a carboxylic acid group and a thiol group. Which of the following is the correct condensed formula for such a molecule?

Accepted Answer

$$\mathrm{HSCH_2COOH}$$

Question 9

Which of the following statements about diastereomers is correct?

Accepted Answer

They are stereoisomers that are not mirror images.

Question 10

How many hydrogen atoms are present in a molecule with the formula $$\mathrm{C_6H_{12}}$$?

Accepted Answer

12

Question 11

Which of the following functional groups is present in acetone?

Accepted Answer

Ketone

Question 12

Which of the following best describes the difference between a cis and a trans isomer?

Accepted Answer

Cis isomers have substituents on the same side of a double bond, while trans isomers have them on opposite sides.

Question 13

Which of the following molecules contains a chiral center?

Accepted Answer

$$\mathrm{CH_3CHBrCH_2CH_3}$$

Question 14

Which of the following is NOT a functional group?

Accepted Answer

Alkane

Question 15

A molecule is redrawn as its mirror image. If the molecule has a chiral center, what is the relationship between the original and the redrawn molecule?

Accepted Answer

They are enantiomers.

Question 16

Which of the following best describes a haloalkane?

Accepted Answer

An alkane with one or more halogen atoms attached.

Question 17

Which of the following is a constitutional isomer of $$\mathrm{C_4H_{10}}$$?

Accepted Answer

Isobutane ($$\mathrm{CH_3CH(CH_3$)_2})$$

Question 18

Which of the following best describes the functional group present in phenol?

Accepted Answer

A hydroxyl group ($$\mathrm{-OH}) $$attached to an aromatic ring

Question 19

Which of the following is a correct statement about conformational isomers?

Accepted Answer

They can be interconverted by rotation around single bonds.

Question 20

Which of the following molecules contains both an alkene and an alcohol functional group?

Accepted Answer

$$\mathrm{CH_2$=CHCH_2OH}$$

Organic Chemistry: Isomerism, Functional Groups, and Chirality

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