Which of the following species is the least stable?
A
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B
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C
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D
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Solution
The correct option is D a. ⇒ Aromatic (6 πe− conjugation) b. ⇒ Non-Aromatic ∵sp3 hybridised carbon, making the species non-planar. c. ⇒ Aromatic (6 πe− conjugation) d. ⇒ Anti-aromatic (4πe− conjugation) Antiaromatic compounds are of least stability because of increase number of electrons in antibonding molecular orbitals. Hence, option (d) is the least stable compound.