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Question

What is the test to differentiate between penta-2-one and pentan-3-one?

A
lodoform test
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B
Benedict's test
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C
Fehling's test
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D
Tollen's test
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Solution

The correct option is A lodoform test
The iodoform reaction been used as a chemical test for the presence of a methyl ketone moiety.
Acetone and acetaldehyde have methyl ketone moiety thus give iodoform reaction. Only those alcohols which contain CHOHCH3 group undergo haloform reaction.

Penta-2-one gives Tollen's test because it has methyl ketone moeity (COCH3).but pentan-3-one does not because it doesnot have methyl ketone moeity (COCH3).
Ketones donot respond to Tollen's, Fehling's and Benedict's test.
Hence option (a) is correct.

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