Question 1

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

Accepted Answer

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

Question 2

What is the general formula for straight-chain alkanes?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n+2}$$

Question 3

Which of the following is a constitutional (structural) isomer of butane ($$\mathrm{C}_4\mathrm{H}_{10}$$)?

Accepted Answer

2-methylpropane

Question 4

Given the condensed formula $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$$, what is the IUPAC name of this compound?

Accepted Answer

Butane

Question 5

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

Accepted Answer

Alkanes are nonpolar and water is polar, so there are no strong intermolecular attractions between them.

Question 6

What is the correct IUPAC name for the following structure?

$$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}(\,\mathrm{CH}_3)\mathrm{CH}_2\mathrm{CH}_3$$

Accepted Answer

3-methylpentane

Question 7

Which of the following statements about cycloalkanes is TRUE?

Accepted Answer

Cycloalkanes have the general formula $$\mathrm{C}_n\mathrm{H}_{2n}.$$

Question 8

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

Accepted Answer

$$\mathrm{C}(\mathrm{CH}_3)_4$$

Question 9

Which of the following best describes the difference between conformers and constitutional isomers?

Accepted Answer

Conformers have the same connectivity and can be interconverted by rotation around single bonds, while constitutional isomers have different connectivity.

Question 10

Which of the following is the correct IUPAC name for a molecule with the structure shown below?

A six-carbon ring with methyl groups at carbons 1 and 3.

Accepted Answer

1,3-dimethylcyclohexane

Question 11

Which of the following statements about the physical properties of alkanes is FALSE?

Accepted Answer

Alkanes are generally soluble in water.

Question 12

What is the product of the complete combustion of octane ($$\mathrm{C}_8\mathrm{H}_{18}$$)?

Accepted Answer

$$8\ \mathrm{CO}_2$$ and $$9\ \mathrm{H}_2\mathrm{O}$$

Question 13

Which of the following best describes a primary carbon atom?

Accepted Answer

A carbon atom bonded to only one other carbon atom.

Question 14

Which of the following is the correct IUPAC name for the compound with the condensed formula $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$$?

Accepted Answer

Pentane

Question 15

Which of the following statements about London dispersion forces is correct?

Accepted Answer

They are the only intermolecular forces present in nonpolar molecules like alkanes.

Question 16

A molecule has the formula $$\mathrm{C}_6\mathrm{H}_{14}. $$Which of the following could be its structure?

Accepted Answer

Hexane

Question 17

Which of the following is the correct IUPAC name for a molecule with a six-carbon chain and a methyl group on carbon 2?

Accepted Answer

2-methylhexane

Question 18

Which of the following is a correct statement about the effect of branching on the boiling point of alkanes?

Accepted Answer

Branched alkanes have lower boiling points than their straight-chain isomers.

Question 19

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

A five-carbon ring with a methyl group attached.

Accepted Answer

Methylcyclopentane

Alkanes: Structure, Nomenclature, Isomerism, and Properties

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