Provide the IUPAC names for the following compounds (I) and (II): (I) A benzene ring with a carboxyl group and methyl groups at positions 2 and 6. (II) A benzene ring with a carboxyl group and a chlor

The compound consists of a benzene ring directly attached to a carboxyl group $(-\text{COOH})$, which is benzoic acid.

The carbon atom bearing the carboxyl group is designated as C1. The numbering proceeds around the ring to give the lowest possible locants to the substituents.

There are two methyl groups $(-\text{CH}_3)$. One is at C2 and the other is at C6.

The name is 2,6-dimethylbenzoic acid.

The name of compound (I) is: $\boxed{\text{2,6-dimethylbenzoic acid}}$

II)

The compound consists of a benzene ring directly attached to a carboxyl group $(-\text{CO}_2\text{H})$, which is benzoic acid.

The carbon atom bearing the carboxyl group is designated as C1. The numbering proceeds around the ring to give the lowest possible locant to the substituent.

There is a chlorine atom $(-\text{Cl})$ at C3.

The name is 3-chlorobenzoic acid.

The name of compound (II) is: $\boxed{\text{3-chlorobenzoic acid}}$

III)

The compound consists of a benzene ring directly attached to a carboxyl group $(-\text{COOH})$, which is benzoic acid.

The carbon atom bearing the carboxyl group is designated as C1. The numbering proceeds around the ring to give the lowest possible locant to the substituent.

There is an isopropyl group $(-\text{CH}(\text{CH}_3)_2)$ at C4.

The name is 4-isopropylbenzoic acid.

The name of compound (III) is: $\boxed{\text{4-isopropylbenzoic acid}}$