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JEE Main levelSingle correct optionDifficulty 2 of 3ro063

Which compound gives a yellow precipitate of iodoform with $I X_{2}$ / $NaOH$ ?

Abutan-1-ol
Bbutan-2-ol
Cpentan-3-ol
D2-methylpropan-2-ol

Answer: B

The haloform reaction needs a

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

or

CH X_{3} - CO X^{-}

unit. Hypoiodite first oxidises butan-2-ol to butanone, which has

CH X_{3} CO X^{-}

and gives

CHI X_{3}

. The other three alcohols have no such unit.

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