Which of the following is a pair of functional isomers?

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${CH}_{3} {COCH}_{3}, {CH}_{3} CHO$

$C_{2} H_{5} {CO}_{2} H, {CH}_{3} {CO}_{2} C_{2} H_{5}$

${CH}_{3} COOH, {CH}_{3} CHO$

$C_{2} H_{5} {CO}_{2} H, {CH}_{3} {CO}_{2} {CH}_{3}$

answer is B.

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Detailed Solution

Functional isomers are compounds with similar molecular formulas but distinct functional groups.
For (A), since the molecular formula is different, they are not isomers.
For (B), the acid and ester are functional isomers since they share the same molecular formula.
For (C), since the molecular formula is different, they are not isomers.
For (D), since the molecular formula is different, they are not isomers.

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