Benzene and Alkyl Benzene - Result Question 27

####31. Which compound(s) out of the following is/are not aromatic? (2019 Main, 11 Jan I) (a)

(c)

(b)

(d)

(c) (i)

(ii)

(ii)

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Solution:

  1. A compound is considered to be aromatic, if it follows three rules:

(a) Must be cyclic and planar.

(b) Must have conjugated system in it.

(c) It must follow Huckel rule which states that number of π-electrons =(4n+2)

(A) 2πesystem[(4n+2)π,n=0] Aromatic

(B) 5 d) 4πesystem[4nπ,n=1] Anti-aromatic

(C) 1

(D) Δp3 The sp3-carbon does not support conjugation and   also devoids planarity.   Non-aromatic 



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