Question 1

Which of the following statements correctly describes the difference between saturated and unsaturated hydrocarbons?

Accepted Answer

Saturated hydrocarbons contain only C–C single bonds and are fully hydrogenated, while unsaturated hydrocarbons contain C=C or C≡C bonds and can react with hydrogen.

Question 2

What is the general formula for straight-chain alkanes?

Accepted Answer

$\mathrm{C}_n\mathrm{H}_{2n+2}$

Question 3

Which of the following is the correct IUPAC name for the molecule with the condensed formula $(\mathrm{CH}_3)_2\mathrm{CHCH}_2\mathrm{CH}_3$?

Accepted Answer

2-Methylbutane

Question 4

Which alkane is a gas at room temperature and has the lowest boiling point among the following?

Accepted Answer

Methane

Question 5

Given the following structure, what is the correct IUPAC name?

$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}(\mathrm{CH}_3)\mathrm{CH}_2\mathrm{CH}_3$

Accepted Answer

2-Methylpentane

Question 6

Which of the following is NOT a correct property of alkanes?

Accepted Answer

Alkanes are highly reactive with acids under normal conditions.

Question 7

What is the correct condensed structural formula for 2,2-dimethylpropane?

Accepted Answer

$(\mathrm{CH}_3)_4\mathrm{C}$

Question 8

Which of the following is the correct line-angle formula for n-butane?

Accepted Answer

A zig-zag line with four carbon vertices in a row

Question 9

If you hydrogenate ethene ($\mathrm{C}_2\mathrm{H}_4$), what is the product?

Accepted Answer

$\mathrm{C}_2\mathrm{H}_6$

Question 10

Which of the following is the correct IUPAC name for the molecule shown below?

A six-carbon chain with methyl groups on carbons 2 and 4.

Accepted Answer

2,4-Dimethylhexane

Question 11

Which of the following statements about isomers is correct?

Accepted Answer

Isomers have the same molecular formula but different structural formulas.

Question 12

What is the correct IUPAC name for the following molecule?

A five-carbon chain with a methyl group on carbon 3.

Accepted Answer

3-Methylpentane

Question 13

Which of the following alkyl groups is derived from propane?

Accepted Answer

Propyl

Question 14

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

Accepted Answer

$(\mathrm{CH}_3)_2\mathrm{CHCH}_3$

Question 15

Which of the following is the correct order of boiling points for the following alkanes: methane, pentane, octane?

Accepted Answer

Methane < Pentane < Octane

Question 16

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

A seven-carbon chain with ethyl groups on carbons 3 and 5.

Accepted Answer

3,5-Diethylheptane

Question 17

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

A six-carbon chain with methyl groups on carbons 2 and 3, and an ethyl group on carbon 4.

Accepted Answer

4-Ethyl-2,3-dimethylhexane

Question 18

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

A five-carbon chain with two methyl groups on carbon 2.

Accepted Answer

2,2-Dimethylpentane

Question 19

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

A six-carbon chain with methyl groups on carbons 2 and 3, and a propyl group on carbon 4.

Accepted Answer

4-Propyl-2,3-dimethylhexane

Hydrocarbons: Classification, Structure, and Nomenclature

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