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Question

Which of the following compound is not aromatic?

A
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B
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C
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D
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Solution

The correct option is A
(a) 1,3-cyclobutadiene is a cyclic, planar conjugated molecule having 4 π-electrons. Therefore, it is not an aromatic compound.

(b)
Pyridine is a cyclic, planar conjugated molecule having 6 π-electrons. Therefore, it is an aromatic compound.
(Here lone pair of electrons of N are not involved in delocalisation.)

(c)
Furan is a cyclic, planar conjugated molecule having 6 π-electrons. Therefore, it is an aromatic compound.

(d)
Thiophene is a cyclic, planar conjugated molecule having 6 π-electrons. Therefore, it is an aromatic compound.

Hence option (a) is correct.

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