Question 1

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

Accepted Answer

Alkanes are nonpolar and cannot form significant dipole-dipole or hydrogen bonding interactions with water.

Question 2

Given the condensed formula $$(CH_3$)_2CHCH_2CH_3$$, what is the correct IUPAC name for this compound?

Accepted Answer

2-methylbutane

Question 3

Which intermolecular force is primarily responsible for the higher boiling point of alcohols compared to alkanes of similar molecular weight?

Accepted Answer

Hydrogen bonding

Question 4

What is the general formula for cycloalkanes?

Accepted Answer

$$C_nH_{2n}$$

Question 5

Which of the following compounds contains a carbon-carbon triple bond?

Accepted Answer

Ethyne

Question 6

A student is given a compound with the formula $$C_4H_{10}. $$Which statement is true about its possible structures?

Accepted Answer

It can exist as both a straight-chain and a branched-chain alkane (isomers).

Question 7

Which of the following best describes the hybridization and bond angles in ethyne ($$C_2H_2$$)?

Accepted Answer

Each carbon is $$sp$$ hybridized with a bond angle of $$180^	ext{o}.$$

Question 8

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

Accepted Answer

$$(CH_3$)_4C$$

Question 9

Which of the following statements about boiling points is correct?

Accepted Answer

Straight-chain alkanes have higher boiling points than their branched isomers due to greater surface area.

Question 10

What is the correct IUPAC name for the compound with the condensed formula $$CH_3CH_2CH_2CH_2CH_3$$?

Accepted Answer

Pentane

Question 11

Which of the following is a correct statement about the solubility of organic compounds?

Accepted Answer

Polar organic compounds are generally more soluble in water than nonpolar compounds.

Question 12

Which of the following is the correct line-bond (Kekulé) structure for ethene?

Accepted Answer

A structure with two carbons connected by a double bond, each bonded to two hydrogens.

Question 13

Which of the following best describes the effect of increasing the number of carbons in a straight-chain alkane on its physical properties?

Accepted Answer

Boiling point increases and solubility in water decreases.

Question 14

Which of the following is the correct IUPAC name for the compound with the condensed formula $$CH_3CH_2CH_2OH$$?

Accepted Answer

Propanol

Question 15

A compound contains a carbonyl group ($$C=O) $$bonded to two alkyl groups. What class of organic compound does this describe?

Accepted Answer

Ketone

Question 16

Which of the following is the correct order of increasing boiling points for the following compounds: propane, propanol, propanal?

Accepted Answer

Propane \u003c Propanal \u003c Propanol

Question 17

Which of the following statements about orbital hybridization in alkenes is correct?

Accepted Answer

Each carbon in an alkene is $$sp^2$$ hybridized.

Question 18

Which of the following is the correct IUPAC name for the compound with the condensed formula $$CH_3CH_2COOH$$?

Accepted Answer

Propanoic acid

Question 19

A student mixes hexane and water in a beaker. After shaking, the liquids separate into two layers. Which statement best explains this observation?

Accepted Answer

Hexane is nonpolar and does not mix with polar water due to lack of favorable intermolecular forces.

Fundamentals of Alkanes, Nomenclature, and Intermolecular Forces in Organic Chemistry

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