Which of the following is non `-` aromatic in nature ?

Options

A.
B.
C.
D.

Answer

b

Explanation

`a. 10 pi bar(e)s` in delocalisation `implies` Aromatic
`b. 1- pi bar(e) s `in delocalisation, but is non`-` aromatic because ring is non`-` planar, as the `H` atoms that point to the interior to the ring interfere with each other.
`c.` `=6 bar(e)s` in delocalisation (only one lone pair is delocalise) `implies` Aromatic
`d.` `=6 bar(e)s` in delocalisation `implies` Aromatic
So the answer is `(b)`.