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How many sp2-hybridised carbon atoms are present in the molecule Aspartame?

1. 7
2. 9
3. 8
4. 6

Correct answer: 9

Solution

Aspartame (Asp-Phe methyl ester) has 6 aromatic-ring sp2 carbons plus 3 carbonyl carbons (one carboxylic acid, one amide, one ester), giving 9 sp2 carbons.

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