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Q.

Which of the following is not an aromatic compound?

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a

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b

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c

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d

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answer is A.

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Detailed Solution

  • Aromatic compounds are planar structure, cyclic, complete conjugated system (electron delocalisation) and follows Huckel rule (4n+2) n=0,1,2,3... 
  • In compounds if there is odd no. of pibonds then it is aromatic. 
  • Anti-aromatic compounds have planar structure, cyclic, conjugation, does not follow huckel rule. It follows (4n) rule. 
  • Cyclopropenyl cation follow (4n+2) rule: aromatic.
  • Pyrrole delocalised electron pair of nitrogen follow huckel rule (4n+2): aromatic.
  • Cycloheptatrienyl cation follow (4n+2) rule: aromatic.
  • Cycloheptatrienyl anion follow (4n) rule: anti-aromatic. 
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