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Question

Which of the following compound is not aromatic?

A
1, 3-cyclobutene
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B
Pyridine
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C
Furan
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D
Thiophene
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Solution

The correct option is A 1, 3-cyclobutene
(a) Number of π electrons =4
It is not equal to 4n+2
It is not an aromatic compound

(b) Number of π electrons =6(=4n+2)
(Here lone pair of electrons of N does not involve in delocalisation)

(c) Number of π electrons
=4+2=6(=4n+2)

(d) Number of π electrons =6(=4n+2)
Thus, except 1,3cyclobutene, all species are aromatic in nature.

Hence option A is correct.

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