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Question 38

Which of the following compounds is not aromatic?

Solution

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(4n+2) pi electrons = Aromatic

4n pi electrons = Anti- Aromatic

Negative Charge = Lone Pair = 2 electrons

A = 2+2+2 = 6 pi electrons

B = 2+2+2 = 6 pi electrons, nitrogen's lone pair don't undergo resonance

C = 2+2+2 = 6 pi electrons including the electrons from lone pair of Nitrogen.

D = 2+2 = 4 pi electrons anti-aromatic


 

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