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Which of the following compounds does NOT contain any sp2 hybridised carbon atom?

1. Acetamide
2. Acetic acid
3. Acetonitrile
4. Acetone

Correct answer: Acetonitrile

Solution

Acetamide (CH3CONH2), acetic acid (CH3COOH) and acetone (CH3COCH3) each contain a carbonyl carbon (C=O) which is sp2 hybridised. Acetonitrile (CH3-C(triple bond)N) has its functional carbon triple-bonded to nitrogen, making that carbon sp hybridised; the methyl carbon is sp3. So acetonitrile has no sp2 carbon.

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