Question

According to Huckel rule, an aromatic compound must possess:

• A. $(4n+1)\pi$ electrons
• B. $(4n+2)\pi$ electrons
• C. $(2n+2)\pi$ electrons
• D. $4n\pi$ electrons

Answer 1

The correct option is B $(4n+2)\pi$ electrons

According to Huckel's rule, an aromatic compound must be cyclic, planar, delocalization of $\pi$ electrons and they should have $(4n+2)\pi e^{-}.$
Where n = 1, 2, 3, .... $\infty .$

For example:-

(1) It is cyclic
(2) It is planar
(3) It has delocalizaiton of double bond.
(3) Have $6\pi$ electrons.

Suppose, n = 1
then $(4\pi +2)1\Rightarrow 6\pi e^{-}.$