# Explain why the following systems are not aromatic?

0 votes
871 views

Explain why the following systems are not aromatic?

(i) (ii) (iii) ## 1 Answer

+1 vote
by (128k points)
selected by

Best answer

(i) For the given compound, the number of π-electrons is 6.

By Huckel’s rule,

4n + 2 = 6

4n = 4 n = 1

For a compound to be aromatic, the value of n must be an integer (n = 0, 1, 2…). Since the value of n is an integer, the given compound is aromatic in nature.

(ii) For the given compound, the number of π-electrons is 4.

By Huckel’s rule,

4n + 2 = 4

4n = 2  n=1/2

For a compound to be aromatic, the value of n must be an integer (n = 0, 1, 2…), which is not true for the given compound. Hence, it is not aromatic in nature.

(iii) For the given compound, the number of π-electrons is 8.

By Huckel’s rule,

4n + 2 = 8

4n = 6  n=3/2

For a compound to be aromatic, the value of n must be an integer (n = 0, 1, 2…). Since the value of n is not an integer, the given compound is not aromatic in nature.

0 votes
1 answer
0 votes
1 answer
0 votes
1 answer
0 votes
1 answer
0 votes
1 answer