Question

Examine the relation between the following pairs of compounds.

• A. All I, II, III are identical
• B. All I, II,III are isomers
• C. I. II are identical. III is isomer
• D. I is identical and II, III are isomer

Answer 1

The correct option is C I. II are identical. III is isomer

1) Chloro groups are present in both at position $1,2$ so are identical.
2) Hydroxy groups are present at position $1,3$ so both are identical.
3) $COOH$ groups are present at different positions but the compound is same so they are isomers but not identical.