Which of the following is a non-aromatic compound?
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 Criteria for simple aromatics are:
1. The molecule must follow Huckel's rule, having 4n + 2 electrons in the delocalized, conjugated p-orbital cloud; 2. The molecule must be planar; 3. The molecule must be cyclic; 4. Every atom in the ring must be able to participate in delocalizing the electrons by having a p-orbital or an unshared pair of electrons.
In the given compounds: a. is non-aromatic (Rule 1 is not followed) b. is aromatic c. is antiaromatic d. is aromatic