Question 1

Which of the following best describes the difference between a condensed structure and a Lewis structure for organic molecules?

Accepted Answer

A condensed structure summarizes the connectivity of atoms without showing all bonds, while a Lewis structure displays all atoms and bonds explicitly.

Question 2

Which of the following is the correct molecular formula for octane, a component of gasoline?

Accepted Answer

$$\mathrm{C_8H_{18}}$$

Question 3

Which of the following functional groups is present in all amino acids?

Accepted Answer

Carboxylic acid

Question 4

A hydrocarbon with the formula $$\mathrm{C_5H_{10}} is $$most likely which type of compound?

Accepted Answer

Cycloalkane

Question 5

Which of the following statements about alkanes is TRUE?

Accepted Answer

Alkanes are generally nonpolar and insoluble in water.

Question 6

Which of the following best describes a chiral carbon atom?

Accepted Answer

A carbon atom bonded to four different atoms or groups.

Question 7

Which of the following is a correct example of a structural (constitutional) isomer?

Accepted Answer

Two molecules with the same molecular formula but different connectivity of atoms.

Question 8

Which functional group is present in the molecule acetone, a common solvent?

Accepted Answer

Ketone

Question 9

A triglyceride molecule contains which of the following functional groups?

Accepted Answer

Ester

Question 10

Which of the following best explains why saturated fatty acids are solid at room temperature while unsaturated fatty acids are liquid?

Accepted Answer

Saturated fatty acids have only single bonds, allowing them to pack closely together.

Question 11

Which of the following is the correct general formula for a straight-chain alkane?

Accepted Answer

$$\mathrm{C_nH_{2n+2}}$$

Question 12

Which of the following best describes a cis isomer in alkenes?

Accepted Answer

The two largest groups are on the same side of the double bond.

Question 13

Which of the following functional groups is present in the pain medication morphine?

Accepted Answer

Alcohol

Question 14

Which of the following best describes the structure of benzene?

Accepted Answer

A six-membered ring with alternating single and double bonds.

Question 15

Which of the following is a correct example of a conformational isomer?

Accepted Answer

Two molecules with the same molecular formula and connectivity, but different spatial arrangement due to rotation about a single bond.

Question 16

Which of the following best explains why alkanes are commonly used as fuels such as gasoline and natural gas?

Accepted Answer

Alkanes are nonpolar and release a large amount of energy upon combustion.

Question 17

Which of the following functional groups is found in both acetyl coenzyme A and fatty acids?

Accepted Answer

Carboxylic acid

Question 18

Which of the following best describes an enantiomer?

Accepted Answer

A molecule that is a non-superimposable mirror image of another molecule.

Question 19

Which of the following functional groups is present in the neurotransmitter acetylcholine?

Accepted Answer

Ester

Question 20

A molecule contains a carbon atom bonded to an -OH group, a -CH$$_3$$ group, a -Cl atom, and a -Br atom. Which of the following statements is TRUE?

Accepted Answer

The carbon atom is chiral because it is bonded to four different groups.

Chapter 4: Structures and Functional Groups in Organic Compounds

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