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Question
A compound (X) having molecular formula C3H8O, gives positive iodoform test. On oxidation with acidified K2Cr2O7, (X ) gives (Y). If (Y) also gives positive iodoform test, then (X) and (Y) respectively are:
A compound (X) having molecular formula C3H8O, gives positive iodoform test. On oxidation with acidified K2Cr2O7, (X ) gives (Y). If (Y) also gives positive iodoform test, then (X) and (Y) respectively are:
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Solution
The correct option is B CH3CH(OH)CH3,CH3COCH3
(X)−CH3−C|HOH−CH3K2Cr2O7−−−−−→CH3−O||C−CH3(y)
(X) with molecular formula C3H8O is an alcohol. CH3−CH2−CH2−OH, propanol.
But since K2Cr2O7 being a strong oxidising agent would oxidise 1° alcohol to carboxylic acid, which will give negative iodoform test, thus (X) has to be a 2° alcohol.
Acetone would give positive iodoform test.
Thus (B) is the correct answer.
(X)−CH3−C|HOH−CH3K2Cr2O7−−−−−→CH3−O||C−CH3(y)
But since K2Cr2O7 being a strong oxidising agent would oxidise 1° alcohol to carboxylic acid, which will give negative iodoform test, thus (X) has to be a 2° alcohol.
Acetone would give positive iodoform test.
Thus (B) is the correct answer.
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