question_answer

Which of the following compounds is not aromatic?

A)

B)              

C)                         

D)

Correct Answer: C

Solution :

[c] Has a cyclic closed of \[2\pi \]electrons and hence it is aromatic And [d] have a cyclic cloud of six \[\pi \]-electrons and hence are aromatic while [c] has 471 electrons and hence is anti-aromatic.             For a molecule to be aromatic: It should have single cyclic cloud of delocalized Tr-electrons. It should be planar. It should contain \[\left( 4n+2 \right)\pi \]electrons where n = 0, 1, 2, 3 etc.