Q: Which of the following is the correct expanded structural formula for propane?

$$\mathrm{H-C-H}$$ \newline $$|$$ \newline $$H-C-H$$ \newline $$|$$ \newline $$H-C-H$$ \newline $$|$$ \newline $$H$$

Question 1

Which of the following statements best describes a hydrocarbon?

Accepted Answer

A compound composed only of carbon and hydrogen atoms.

Question 2

What is the condensed structural formula for hexane?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2CH_2CH_3}$$

Question 3

Which property is NOT typical of organic compounds?

Accepted Answer

High melting and boiling points (above $$250^\circC)$$

Question 4

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

Accepted Answer

3-methylpentane

Question 5

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

Accepted Answer

$$\mathrm{CH_3CH(CH_3$)CH_2CH_3}$$

Question 6

Which alkyl group is represented by the following structure: $$\mathrm{CH_3CH_2CH_2-}$$?

Accepted Answer

Propyl

Question 7

What is the correct name for a cycloalkane with five carbon atoms?

Accepted Answer

Cyclopentane

Question 8

Which of the following is a correct representation of a line-angle formula for butane?

Accepted Answer

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

Question 9

Which halogen substituent is correctly named according to IUPAC rules?

Accepted Answer

Fluoro

Question 10

Which of the following statements about alkanes is TRUE?

Accepted Answer

Alkanes are saturated hydrocarbons containing only single bonds.

Question 11

What is the molecular formula for cyclohexane?

Accepted Answer

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

Question 12

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

Accepted Answer

They are flammable and release energy when combusted.

Question 13

Which of the following is the correct expanded structural formula for propane?

Accepted Answer

$$\mathrm{H-C-H}$$ 
ewline $$|$$ 
ewline $$H-C-H$$ 
ewline $$|$$ 
ewline $$H-C-H$$ 
ewline $$|$$ 
ewline $$H$$

Question 14

Which of the following is a constitutional isomer of $$\mathrm{C_4H_{10}}$$?

Accepted Answer

Isobutane

Question 15

Which statement about alkyl groups is correct?

Accepted Answer

An alkyl group is a carbon branch attached to a main carbon chain.

Question 16

Which of the following is the correct name for a molecule with a methyl group attached to the second carbon of cyclohexane?

Accepted Answer

2-methylcyclohexane

Question 17

Which of the following is a correct property of cycloalkanes compared to straight-chain alkanes?

Accepted Answer

Cycloalkanes have two fewer hydrogens than their straight-chain counterparts.

Question 18

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

Accepted Answer

A pentagon shape with each vertex representing a carbon atom.

Question 19

Which of the following is the correct IUPAC name for a molecule with a bromo substituent on the first carbon and a methyl substituent on the second carbon of cyclohexane?

Accepted Answer

1-bromo-2-methylcyclohexane

Question 20

Which of the following is a correct statement about the use of alkanes in real-world applications?

Accepted Answer

Octane is used in gasoline to prevent premature ignition of the air-fuel mixture in engines.

Introduction to Hydrocarbons and Alkanes: Structure, Nomenclature, and Isomerism

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