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Which of the following is aromatic carbocation?

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a
b
c
d

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detailed solution

Correct option is B

[Step 1]:In option (1), two carbons are sp3 and non-planar.Non conjugated and not obeys Huckel’s rule[Step 2]:In option (2) all three carbons are SP2 planar cyclic, conjugated and contains 2πe- i.e,  obeys Huckel’s rule. Therefore it is an aromatic compound[Step 3]:In option (3) one carbon is SP3 and non-planar[Step 4]:In option (4) , number of πe- are 4 i.e, not obeys Huckel’s rule.

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