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Question

Among the following, the number of anti-aromatic compound(s) is/are:



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Solution

Structure (i) : Planar, has resonance and has 4 π e or 4nπ e thus making it anti-aromatic.
Structure (ii) : Planar, has resonance and has 8 π e or 4nπ e thus making it anti-aromatic.
Structure (iii) : Non-planar, since sp3 hybridised carbon is there. So, non aromatic.
Structure (iv) : Planar, has resonance and has 4 π e or 4nπ e thus making it anti-aromatic.
Structure (v) : Planar , has resonance and has 6 π e or (4n+2)π e, i.e. it follows huckel rule, thus making it aromatic.
Structure (vi) : Planar , has resonance and has 6 π e or (4n+2)π e, i.e. it follows huckel rule, thus making it aromatic.
Total number of anti aromatic compounds are 3.



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