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  4. The reagents which can be used to distinguish acetophenone from benzophenone is (are)

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Q. The reagents which can be used to distinguish acetophenone from benzophenone is (are)

AIPMTAIPMT 1990Aldehydes Ketones and Carboxylic Acids

Solution:

The structures of acetophenone and benzophenone are
image
When acetophenone containing $CH _{3}- \overset{\underset{||}{O}}{C} -$ unit, is treated with $I _{2}$ and $Na _{2} CO _{3}$ it forms yellow precipitate of $CHI _{3}$ whereas benzophenone does not give this test. Acetophenons gives iodoform test due to presence of $- COCH _{3}$ group.