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JEE Main levelSingle correct optionDifficulty 2 of 3nm134

$CH X_{3} CH X_{2} CH X_{2} COOH$ and $CH X_{3} COOCH X_{2} CH X_{3}$ are related as

Afunctional isomers
Bchain isomers
Cposition isomers
Dmetamers

Answer: A

Both are

C X_{4} H X_{8} O X_{2}

. One is a carboxylic acid (butanoic acid) and the other is an ester (ethyl ethanoate), so the functional group differs: functional isomerism.

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