JEE Main Chemistry question

Which of the following annulenes is aromatic according to Hückel's rule?

(A)Cyclobutadiene ( -electrons)
(B)Cyclooctatetraene ( -electrons, tub-shaped, non-planar)
(C)Benzene (, )Correct
(D)Cyclodecapentaene (non-planar due to steric strain)

Answer: (C)

Solution

Hückel's rule requires a cyclic, planar, fully conjugated system with -electrons for aromaticity. Benzene (6 -electrons, ) satisfies all four criteria. Cyclobutadiene (4 -electrons) and cyclooctatetraene (8

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Question ID VK-142407