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JEE Main levelSingle correct optionDifficulty 2 of 3co116

Which of the following does NOT give iodoform on warming with $I X_{2}$ and $NaOH$ ?

A $CH X_{3} COCH X_{2} CH X_{3}$
B $CH X_{3} CH (OH) CH X_{2} CH X_{3}$
C $CH X_{3} CH X_{2} CH (OH) CH X_{2} CH X_{3}$
D $C X_{6} H X_{5} CH (OH) CH X_{3}$

Answer: C

Butan-2-one is a methyl ketone, butan-2-ol and 1-phenylethanol have

CH X_{3} CH (OH) X^{-}

and are oxidised to methyl ketones. Pentan-3-ol,

CH X_{3} CH X_{2} CH (OH) CH X_{2} CH X_{3}

, would give pentan-3-one, which has no

CH X_{3} CO X^{-}

group.

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