(i) Phthalic acid - (b) Benzene-1,2-dicarboxylic acid

(ii) Oxalic acid - (e) Ethane-1,2-dioic acid

(iii) Succinic acid - (d) Butane-1,4-dioic acid

(iv) Adipic acid - (a) Hexane-1,6-dioic acid

(v) Glutaric acid - (c) Pentane-1,5-dioic acid

EXPLAINATION:

(i) The structure of Phthalic acid is:

The functional group in this compound is carboxylic acid. Two carboxylic groups are present on the adjacent carbon atom on the benzene ring. Thus, the IUPAC name of Phthalic acid is Benzene-1,2-dicarboxylic acid.

(ii) The structure of Oxalic acid is:

HOOC-COOH

The functional group in this compound is carboxylic acid. Two carboxylic groups are present on the adjacent carbon atoms. Thus, the IUPAC name of Oxalic acid is Ethane-1,2-dioic acid.

(iii) The structure of Succinic acid is:

HOOC -(CH₂)₂-COOH

The functional group in this compound is carboxylic acid. Two carboxylic groups are present on the first and the last carbon atom. Thus, the IUPAC name of Succinic acid is Butane-1,4-dioic acid.

(iv) The structure of Adipic acid is:

HOOC -(CH₂)₄-COOH

The functional group in this compound is carboxylic acid. The number of carbon atoms in the longest chain is four. Thus, the IUPAC name of Adipic acid is Hexane-1,6-dioic acid.

(v) The structure of Glutaric acid is:

HOOC -(CH₂)₃-COOH

The functional groups in this compound are carboxylic acids. The number of carbon atoms in the longest chain is five. Thus, the IUPAC name of Glutaric acid is Pentane-1,5-dioic acid.