Question

Which of the following pairs are related as position isomers?

• A. $C{H}_2\left(OH\right)C{H}_{2}COOHandC{H}_3-CH\left(OH\right)COOH$
• B. $C_2{H}_{5}OHandC{H}_{3}OC{H}_3$
• C. $(C_2{H}_5{)}_{2}COandC{H}_{3}CH=C(OH)C{H}_{2}C{H}_3$
• D. All the above

Answer 1

The correct option is A $C{H}_2\left(OH\right)C{H}_{2}COOHandC{H}_3-CH\left(OH\right)COOH$

Structural isomers with a difference in the position of multiple bond/functional group/alkyl substituent on the same carbon skeleton (parent chain) is called position isomers.
In (a), OH is positioned at different carbon atoms. Hence, they are position isomers.

In (b), we have alcohol and ether functional groups. Hence they are functional isomers.
In (c), the aklyl groups around carbonyl functional group is different. Hence they are metamers.