Which of the following species is antiaromatic?

Options

A.
B.
C.
D.

Answer

2

Explanation

Planar cunjugated carbocyclic polyenes that are especially less stable than their open chain analogs (acyclic polyenes) are called antiaromatic According to Huckel's rule antiaromatic species possess `4n(n=1,2,3`…) `pi` electrons.
Compounds (2) is planar and has `8pie^(-)`s`(4npi,n=2)` while compound (3) is nonplanar and has `12pie^(-)s(4npi,n=3)`
Compound (1) and (4) possess `10pie^(-)s(4n+2,n=2)`.