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Which of the following systems are aroma...

Which of the following systems are aromatic?

A

B

C

D

Text Solution

Verified by Experts

Although (a) has 10 conjugated pi electrons it is non-aromatic due to lack of planarity of the ring as

(b) has 16(4n) pi-electrons, hence antiaromatic. (c) (azulene) and (d) are aromatic system as they satisfy Huckel rule.
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