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JEE Main levelSingle correct optionDifficulty 2 of 3co117

4-Methylpentan-2-one, $(CH X_{3}) X_{2} CHCH X_{2} COCH X_{3}$ , is treated with $NaOCl$ in aqueous $NaOH$ and then acidified. The organic acid obtained is

A4-methylpentanoic acid
B3-methylbutanoic acid
C2-methylpropanoic acid
Dethanoic acid

Answer: B

In the haloform reaction

RCOCH X_{3}

gives

RCOOH

(one carbon less) and

CHCl X_{3}

. Here

R = (CH X_{3}) X_{2} CHCH X_{2} X^{-}

, so the acid is

(CH X_{3}) X_{2} CHCH X_{2} COOH

, 3-methylbutanoic acid.

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