Among the following compounds which non aromatic: a) b) c) d)

option D. here sp3 carbon is present and also conjunction in whole ring is not possible so molecule is non planar and non aromatic. To be aromatic, molecule must have planar, cycli...

Option D is non aromatic...No complete conjugation. If electron doesn't delocalise then compound is non aromatic.If electron delocalise then on basis of huckel rule you can identif...