Question 1

Which of the following statements best explains why organic compounds generally have lower boiling points than inorganic compounds?

Accepted Answer

Organic compounds are held together by weak intermolecular forces such as London dispersion, dipole-dipole, and hydrogen bonding.

Question 2

What is the general formula for an acyclic (non-cyclic) alkane?

Accepted Answer

$$C_nH_{2n+2}$$

Question 3

Which of the following is NOT a characteristic of most organic compounds?

Accepted Answer

They conduct electricity in aqueous solution.

Question 4

A hydrocarbon with the molecular formula $$C_5H_{12} is $$best classified as:

Accepted Answer

An alkane

Question 5

Which of the following functional groups contains a carbonyl group ($$C=O$$)?

Accepted Answer

Ketone

Question 6

What is the correct IUPAC name for the following structure?

$$\mathrm{CH_3CH_2CH(CH_3$)CH_2CH_3}$$

Accepted Answer

2-methylpentane

Question 7

Which of the following best describes a tertiary carbon atom?

Accepted Answer

A carbon bonded to three other carbons

Question 8

How many hydrogen atoms are present in cyclohexane ($$C_6H_{12}$$)?

Accepted Answer

12

Question 9

Which of the following is a correct IUPAC name for a molecule with a five-carbon chain and a methyl group on the second carbon?

Accepted Answer

2-methylpentane

Question 10

Which of the following best describes the geometry and bond angle around each carbon atom in methane ($$CH_4$$)?

Accepted Answer

Tetrahedral, 109.5°

Question 11

Which of the following is a constitutional isomer of butane ($$C_4H_{10}$$)?

Accepted Answer

Isobutane

Question 12

Which of the following statements about cis-trans isomerism is correct?

Accepted Answer

Cis-trans isomerism occurs in alkenes because rotation around the double bond is restricted.

Question 13

A compound with the formula $$C_7H_{16} is$$:

Accepted Answer

An alkane

Question 14

Which of the following best describes the difference between a straight-chain and a branched-chain alkane?

Accepted Answer

Straight-chain alkanes have all carbons in a row, while branched-chain alkanes have at least one carbon attached to a middle carbon.

Question 15

Which of the following is the correct condensed formula for hexane?

Accepted Answer

$$CH_3$$($$CH_2)_4CH_3$

Question 16

Which of the following is the correct IUPAC name for a molecule with the following structure?

A six-carbon ring with a chlorine atom attached.

Accepted Answer

Chlorocyclohexane

Question 17

Which of the following best describes the difference between organic and inorganic compounds?

Accepted Answer

Organic compounds have carbon as the principal element, while inorganic compounds do not.

Question 18

Which of the following is the correct formula for a cycloalkane with five carbon atoms?

Accepted Answer

$$C_5H_{10}$$

Question 19

Which of the following is a property of inorganic (ionic) compounds?

Accepted Answer

They conduct electricity when dissolved in water.

Question 20

Which of the following is the correct IUPAC name for a molecule with a nine-carbon chain and an ethyl group on carbon 5 and a methyl group on carbon 3?

Accepted Answer

5-ethyl-3-methylnonane

Introduction to Organic Chemistry: Alkanes and Nomenclature

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