Question 1

Which of the following statements best explains why carbon is able to form such a wide variety of organic molecules?

Accepted Answer

Carbon is tetravalent, allowing it to form four covalent bonds with other atoms.

Question 2

Which of the following is the correct IUPAC name for the compound with the condensed formula $CH_3CH_2CH(CH_3)CH_2CH_3$?

Accepted Answer

2-methylpentane

Question 3

A hydrocarbon with the molecular formula $C_5H_{12}$ can exist as several isomers. Which statement about these isomers is correct?

Accepted Answer

They have the same molecular formula but different structural arrangements.

Question 4

Which of the following best describes a functional group in organic chemistry?

Accepted Answer

A group of atoms within a molecule that determines its characteristic chemical reactions.

Question 5

What is the product of the complete combustion of any alkane in excess oxygen?

Accepted Answer

Carbon dioxide and water

Question 6

Which of the following is a correct condensed structural formula for 2,2-dimethylpropane?

Accepted Answer

$(CH_3)_4C$

Question 7

A patient is exposed to a hydrocarbon that is colorless, nonpolar, insoluble in water, and flammable. Which family does this compound most likely belong to?

Accepted Answer

Alkane

Question 8

Which of the following best describes a cycloalkane?

Accepted Answer

An alkane that contains a ring of carbon atoms and has two fewer hydrogens than its straight-chain counterpart.

Question 9

Which of the following is the correct name for the compound shown below?

$\begin{align*}
&	ext{CH}_3-	ext{CH}_2-	ext{CH}_2-	ext{CH}_2-	ext{CH}_3
\end{align*}$

Accepted Answer

Pentane

Question 10

Which of the following statements about alkane reactions is correct?

Accepted Answer

Alkanes can undergo halogenation, where a hydrogen atom is replaced by a halogen atom.

Question 11

A molecule has the following line structure (each vertex is a carbon): a hexagonal ring with a single methyl group attached. What is the correct IUPAC name?

Accepted Answer

Methylcyclohexane

Question 12

Which of the following best describes a tertiary carbon atom?

Accepted Answer

A carbon atom attached to three other carbon atoms.

Question 13

Which of the following is the correct condensed formula for isopropyl group?

Accepted Answer

$CH(CH_3)_2$

Question 14

A student draws the following structure: $CH_3CH_2CH_2CH_2CH_3$. How many primary, secondary, and tertiary carbons are present in this molecule?

Accepted Answer

2 primary, 3 secondary, 0 tertiary

Question 15

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

Accepted Answer

Alkanes are insoluble in water but soluble in nonpolar organic solvents.

Question 16

Which of the following is the correct IUPAC name for a six-carbon ring with two methyl groups attached to carbons 1 and 3?

Accepted Answer

1,3-dimethylcyclohexane

Question 17

Which of the following best describes a conformer?

Accepted Answer

A molecular structure with identical connections between atoms but different spatial arrangements due to rotation about single bonds.

Question 18

A hydrocarbon reacts with chlorine gas in the presence of light, producing $CH_3Cl$ as one of the products. What type of reaction is this?

Accepted Answer

Halogenation

Question 19

Which of the following is the correct name for the compound with the following condensed formula: $CH_3CH_2CH_2CH_2CH_2CH_3$?

Accepted Answer

Hexane

Question 20

A sample of an unknown organic compound is found to be nonpolar, flammable, and less dense than water. It does not conduct electricity and is insoluble in water. Which of the following is the most likely identity of this compound?

Accepted Answer

An alkane

Chapter 12: Alkanes and the Nature of Organic Molecules

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