Question 1

Which of the following statements best explains why alkanes are considered saturated hydrocarbons?

Accepted Answer

Because they contain only single bonds and have the maximum number of hydrogen atoms per carbon atom.

Question 2

What is the general formula for an acyclic alkane?

Accepted Answer

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

Question 3

Which of the following best describes the physical properties of alkanes as the number of carbon atoms increases?

Accepted Answer

Boiling point increases due to greater London dispersion forces.

Question 4

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$$?

Accepted Answer

Butane

Question 5

Which of the following is a correct statement about the combustion of alkanes?

Accepted Answer

The products are always $$\mathrm{CO}_2$$ and $$\mathrm{H}_2\mathrm{O} if $$enough $$\mathrm{O}_2 is $$present.

Question 6

Which of the following is the correct balanced equation for the complete combustion of pentane ($$\mathrm{C}_5\mathrm{H}_{12}$$)?

Accepted Answer

$$\mathrm{C}_5\mathrm{H}_{12} + 8\ \mathrm{O}_2 \rightarrow 5\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O}$$

Question 7

Which of the following is a constitutional isomer of butane ($$\mathrm{C}_4\mathrm{H}_{10}$$)?

Accepted Answer

Isobutane

Question 8

Which of the following statements about alkyl halides is correct?

Accepted Answer

They contain a polar $$\mathrm{C}-\mathrm{X}$$ bond and have higher boiling points than similar alkanes.

Question 9

Which of the following is the correct IUPAC name for a compound with a seven-carbon chain and methyl groups on carbons 2 and 3, and an ethyl group on carbon 4?

Accepted Answer

4-ethyl-2,3-dimethylheptane

Question 10

Which of the following best describes the classification of a carbon atom bonded to three other carbon atoms?

Accepted Answer

Tertiary (3°)

Question 11

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{Cl}$$?

Accepted Answer

1-chloropropane

Question 12

Which of the following cycloalkanes has the molecular formula $$\mathrm{C}_6\mathrm{H}_{12}$$?

Accepted Answer

Cyclohexane

Question 13

Which of the following is the correct order of boiling points for the following alkanes: butane, pentane, hexane?

Accepted Answer

Butane \u003c Pentane \u003c Hexane

Question 14

Which of the following is the correct IUPAC name for a cycloalkane with two methyl groups on carbon 1 and an ethyl group on carbon 2 of a cyclohexane ring?

Accepted Answer

2-ethyl-1,1-dimethylcyclohexane

Question 15

Which of the following is NOT a property of alkanes?

Accepted Answer

They are soluble in water.

Question 16

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{Br}$$?

Accepted Answer

1-bromobutane

Question 17

Which of the following best explains why incomplete combustion of alkanes is dangerous?

Accepted Answer

It produces carbon monoxide, which binds to hemoglobin and reduces oxygen transport.

Question 18

Which of the following is the correct IUPAC name for a compound with a six-carbon ring and a single ethyl group attached?

Accepted Answer

Ethylcyclohexane

Question 19

Which of the following is a correct statement about the rotation around carbon-carbon bonds in alkanes?

Accepted Answer

Rotation can occur freely around single bonds but not around double or triple bonds.

Alkanes and Cycloalkanes: Structure, Properties, and Nomenclature

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