Hydrocarbons - Result Question 66
####68. Which of the following chemical system is non aromatic?
[NEET Kar. 2013]
(a)
(c)
(b)
(d)
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Solution:
- (a) Huckel rule is not obeyed. It has only four electrons. Further it does not have continous conjugation.
In thiophene, one lone pair of electrons are involved in delocalisation.
Thus, the effective number of p-electrons become 6 which is of the form $(4 n+2)$. Also the ring is planar, hence this is an aromatic compound.
