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NEET levelSingle correct optionDifficulty 1 of 3ap038

Several alcohols are warmed with $I X_{2}$ and $NaOH$ . Which of the following does NOT give a yellow precipitate of iodoform?

Aethanol
Bpropan-2-ol
Cbutan-2-ol
Dpropan-1-ol

Answer: D

The test is positive for ethanol and for alcohols of the type

CH X_{3} CH (OH) - R

, because they are oxidised to methyl carbonyl compounds. Propan-1-ol has no

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

unit, so it is negative.

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