Q: Which of the following pairs are constitutional isomers?

$$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$ \text{ and } \mathrm{CH_3CH($$CH_3)CH_2CH_3$$}$

Question 1

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

Accepted Answer

Saturated hydrocarbons contain only carbon-carbon single bonds, while unsaturated hydrocarbons contain one or more carbon-carbon double or triple bonds.

Question 2

What is the correct IUPAC name for the following compound: $$\mathrm{CH_3CH_2CH(CH_3$)CH_2CH_3}$$?

Accepted Answer

3-Methylpentane

Question 3

Which of the following pairs are constitutional isomers?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$ 	ext{ and } \mathrm{CH_3CH($$CH_3)CH_2CH_3$$}$

Question 4

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

Accepted Answer

$$\mathrm{(CH_3$)_4C}$$

Question 5

Arrange the following alkanes in order of increasing boiling point: butane, decane, hexane.

Accepted Answer

Butane \u003c Hexane \u003c Decane

Question 6

Which of the following cycloalkanes has the greatest angle strain?

Accepted Answer

Cyclopropane

Question 7

What is the molecular formula for bicyclo[4.4.0]decane (Decalin)?

Accepted Answer

$$\mathrm{C$$_{10}$$H_{18}}$$

Question 8

Which conformation of butane is the most stable?

Accepted Answer

Anti conformation

Question 9

Which of the following statements about cis-trans isomerism in cycloalkanes is correct?

Accepted Answer

Cis-trans isomerism arises when two substituents are on the same or opposite sides of a ring, and cannot be interconverted without breaking a bond.

Question 10

Which of the following is a chiral molecule?

Accepted Answer

A carbon atom bonded to four different groups

Question 11

What is the correct IUPAC name for the following structure: $$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$?

Accepted Answer

Pentane

Question 12

Which of the following is the correct line-angle formula for 2-methylpentane?

Accepted Answer

A six-carbon chain with a methyl group on the second carbon

Question 13

Which of the following is the correct reaction for the combustion of methane?

Accepted Answer

$$\mathrm{CH_4$ + 2O_2 \rightarrow CO_2$ + 2H_2O}$$

Question 14

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

(Line-angle structure: a seven-carbon chain with a methyl group on carbon 3 and an ethyl group on carbon 5)

Accepted Answer

5-Ethyl-3-methylheptane

Question 15

Which of the following is NOT a correct statement about the physical properties of alkanes?

Accepted Answer

Alkanes are highly polar molecules.

Question 16

Which of the following is the correct molecular formula for cyclopentane?

Accepted Answer

$$\mathrm{C_5H_{10}}$$

Question 17

Which of the following is the most stable conformation of cyclohexane?

Accepted Answer

Chair conformation

Question 18

Which of the following statements about the heat of combustion of alkanes is correct?

Accepted Answer

Branched alkanes have lower heats of combustion per CH$$_2$$ group than straight-chain alkanes.

Alkanes, Cycloalkanes, Isomerism, and Stereochemistry: Step-by-Step Organic Chemistry Guidance

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