Chapter 7 revision

In semi-structural formulas, -COOH represents a ______ functional group.

• hydroxyl

• carboxylic acid

• methyl

• carboxyl

Answer explanation

In semi-structural formulas, -COOH represents a carboxylic acid functional group, making it the correct choice.

Crude oil is

• a renewable source of hydrocarbons

• a mixture of hydrocarbons obtained from the earth using an oil drill

• a mixture of hydrocarbons obtained from the earth using an oil drill

• a non-hydrocarbon form of oil

Answer explanation

Crude oil is a mixture of hydrocarbons obtained from the earth using an oil drill.

The name of the molecule shown is

• pentanol

• pentanoic acid

• pentan-1-ol

• pentan-1-oic acid

Answer explanation

The correct name of the molecule shown is pentan-1-oic acid because it contains a carboxylic acid functional group at the first carbon position.

The name of the following molecule is

• 3-methylpent-ene

• 3-ethylbut-ene

• 2-ethylbut-ene

• 2-ethylbutane

Answer explanation

The correct name of the molecule is 3-methylpent-1-ene because it has a methyl group on the third carbon of a pentene chain.

The molecule shown is used to make PVC, a plastic used in car interiors, pipes, and many more products. Its name, according to IUPAC nomenclature, is

• chloroethene

• ethene chloride

• 2-chloroethene

• 1-chloroethene

Crystal is a Year 11 chemistry student who wants to study the interactions and properties of hydrocarbons with different functional groups. To begin with, she collects samples of ethanol and propanoic acid. Draw the structural formulas of ethanol and propanoic acid in your logbook.

It is known that some of the molecules contain alkyl groups, and therefore structural isomers must be accounted for. Draw and name all the structural isomers of the molecules with the molecular formula C5H12 in your logbook.

Which of the following is a characteristic property of alkanes?

• They contain double bonds between carbon atoms

• They are highly reactive with halogens under normal conditions

• They are saturated hydrocarbons with single bonds only

• They are primarily used as solvents due to their polarity

Which functional group is represented by the -OH group in organic chemistry?

• Ketone

• Aldehyde

• Hydroxyl

• Ester

Answer explanation

The -OH group in organic chemistry represents the Hydroxyl functional group.

What is the IUPAC name for the compound with the formula CH3-CH2-OH?

• Ethanol

• Methanol

• Propanol

• Butanol