Question 1

Which of the following properties is most typical of organic compounds compared to inorganic compounds?

Accepted Answer

Low density and combustibility in air

Question 2

Which elements are always present in organic compounds?

Accepted Answer

Carbon and hydrogen

Question 3

What is the correct condensed structural formula for pentane?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$

Question 4

Which of the following best explains why alkanes are insoluble in water?

Accepted Answer

Alkanes are nonpolar and water is polar

Question 5

What is the IUPAC name for the compound with the following condensed structural formula: $$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$?

Accepted Answer

Pentane

Question 6

Which of the following statements about cycloalkanes is correct?

Accepted Answer

Cycloalkanes have higher boiling points than straight-chain alkanes with the same number of carbon atoms

Question 7

Which of the following is a structural isomer of $$\mathrm{C_5H_{12}}$$?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$

Question 8

What is the correct IUPAC name for the compound with the following structure: a six-carbon chain with methyl groups on carbons 2 and 4, and a bromo group on carbon 4?

Accepted Answer

4-bromo-2,4-dimethylhexane

Question 9

Which of the following is the balanced chemical equation for the combustion of methane?

Accepted Answer

$$\mathrm{CH_4$(g) + 2O_2(g) \rightarrow CO_2$(g) + 2H_2O(g) + energy}$$

Question 10

Which of the following statements about boiling points of alkanes is correct?

Accepted Answer

Boiling points increase as the number of carbon atoms increases

Question 11

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

Accepted Answer

A zigzag line with six vertices

Question 12

Which of the following is the correct IUPAC name for a cycloalkane with a methyl group attached to a five-carbon ring?

Accepted Answer

Methylcyclopentane

Question 13

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

Accepted Answer

Alkanes burn in oxygen to produce carbon dioxide and water

Question 14

What is the correct IUPAC name for the compound with the following condensed structural formula: $$\mathrm{CH_3CH_2CH_2CH_2CH_2CH_3}$$?

Accepted Answer

Hexane

Question 15

Which of the following is the correct formula for the alkyl group derived from propane?

Accepted Answer

$$\mathrm{CH_3CH_2-}$$

Question 16

Which of the following is a property of organic compounds that makes them useful as fuels?

Accepted Answer

They undergo combustion and release energy

Question 17

Which of the following is the correct IUPAC name for a four-carbon chain with methyl groups on carbons 2 and 3?

Accepted Answer

2,3-dimethylbutane

Question 18

Which of the following is a correct statement about structural isomers?

Accepted Answer

Structural isomers have the same molecular formula but different arrangements of atoms

Question 19

Which of the following is the correct condensed structural formula for 2,3-dimethylbutane?

Accepted Answer

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

Introduction to Organic Chemistry: Alkanes and Their Properties

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