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Question

A compound is non aromatic. Which of the following may be true?

A
No pi electrons are present.
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B
Pi electrons are not delocalised.
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C
The compound has non planar structure.
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D
All of the above.
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Solution

The correct option is D All of the above.
A compound is non aromatic. The following may be true.
(A) No pi electrons are present.
(B) Pi electrons are not delocalised.
(C) The compound has non planar structure.
Note:
(1) A cyclic planar compounds with a conjugated system of 4n + 2 pi electrons is aromatic.
(2) A cyclic planar compounds with a conjugated system of 4n pi electrons is anti -aromatic.
All the remaining compounds are non aromatic.

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