JEE Main Chemistry question

Which of the following compounds is aromatic? [BCECE 2008]

(A)Cyclohexane
(B)Cyclohexanol with a pendant phenyl group (not a fully conjugated ring)
(C)Cyclohexanone
(D)The cyclopropenyl cation formed from HC≡C–C(CH)=C(CH) cyclising to a 2-electron 3-membered ringCorrect

Answer: (D)

Solution

A cyclic, planar, fully conjugated carbocation with exactly 2 -electrons ( in the rule) is aromatic — the cyclopropenyl cation is the smallest aromatic system.

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Question ID VK-142283