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Halogenation of Alpha Carbon

CH 3 CHO and ...

Question

$C H_{3} C H O$ and $C_{6} H_{5} C H_{2} C H O$ can be distinguished by:

A

Benedict's test

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B

Iodoform test

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C

Tollen's reagent test

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D

Fehling's solution test

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Solution

The correct option is B
Iodoform test

Benedict's test, Tollen's reagent test, Fehling's solution test will be positive for both the given aldehydes. Only iodoform test can be used to distinguish the two. Acetaldehyde will be converted to formate anion and iodoform.

Only acetaldehyde, methyl ketones, and compounds that could be oxidized to methyl ketones give positive haloform test.

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