Question 1

Which of the following statements about carbon atoms in organic molecules is CORRECT?

Accepted Answer

Carbon can form single, double, or triple covalent bonds, but always a total of four bonds.

Question 2

What is the molecular formula for hexane?

Accepted Answer

$$\mathrm{C_6H_{14}}$$

Question 3

Which of the following best describes an alkane?

Accepted Answer

A hydrocarbon with only single bonds between carbons and saturated with hydrogen.

Question 4

Given the condensed formula $$\mathrm{CH_3CH_2CH_3}$$, what is the name of this compound?

Accepted Answer

Propane

Question 5

Which of the following line-angle structures represents octane?

Accepted Answer

A zig-zag line with 8 vertices, each representing a carbon atom.

Question 6

What is the correct IUPAC name for the following structure?

$$\mathrm{CH_3CH(CH_3$)CH_2CH_2CH_3}$$

Accepted Answer

2-methylpentane

Question 7

A compound has the molecular formula $$\mathrm{C_4H_8}. $$Which of the following could be its structure?

Accepted Answer

A cycloalkane or an alkene

Question 8

Which of the following is the correct condensed formula for 2-butyne?

Accepted Answer

$$\mathrm{CH_3C \equiv $$CCH_3$$}$$

Question 9

When naming a branched alkane, what is the FIRST step according to IUPAC rules?

Accepted Answer

Find the longest continuous carbon chain.

Question 10

Which of the following is the correct name for a molecule with two methyl groups attached to the third carbon of pentane?

Accepted Answer

3,3-dimethylpentane

Question 11

What is the correct IUPAC name for the following structure?

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

Accepted Answer

3-methylpentane

Question 12

Which of the following statements about cycloalkanes is TRUE?

Accepted Answer

Cycloalkanes contain only carbon and hydrogen atoms arranged in a ring.

Question 13

A molecule is named 2-ethyl-3-methylheptane. Which of the following is TRUE about its structure?

Accepted Answer

It has a seven-carbon main chain with an ethyl group on carbon 2 and a methyl group on carbon 3.

Question 14

Which of the following is the correct line-angle (skeletal) structure for but-2-yne?

Accepted Answer

A four-carbon chain with a triple bond between carbons 2 and 3.

Question 15

Which of the following is the correct condensed formula for 1-butene?

Accepted Answer

$$\mathrm{CH_2$=CHCH_2CH_3}$$

Question 16

Which of the following is TRUE regarding the numbering of carbon chains in alkenes and alkynes?

Accepted Answer

Numbering should give the lowest possible number to the first carbon in the double or triple bond.

Question 17

Which of the following is the correct molecular formula for an alkene with six carbon atoms?

Accepted Answer

$$\mathrm{C_6H_{12}}$$

Question 18

A patient is exposed to a compound with the formula $$\mathrm{C_2H_2}. $$Which class of hydrocarbon does this belong to?

Accepted Answer

Alkyne

Question 19

Which of the following is the correct IUPAC name for a molecule with a five-carbon chain and a double bond between carbons 2 and 3?

Accepted Answer

Pent-2-ene

Introduction to Hydrocarbons: Structure, Nomenclature, and Types

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