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JEE Main levelOne or more correct optionsDifficulty 2 of 3ap157

Select all compounds that give a yellow precipitate of iodoform with $I X_{2}$ and aqueous $NaOH$ .

Aethanol
Bpropan-1-ol
C1-phenylethan-1-ol
Dbutan-2-ol

Answer: A, C, D

Ethanol, butan-2-ol and 1-phenylethan-1-ol all contain the

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

unit, which is oxidised by hypoiodite to a methyl ketone or acetaldehyde and then iodinated and cleaved to

CHI X_{3}

. Propan-1-ol lacks this unit.

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