Q.

Which of the following compounds is not aromatic?

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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 C.

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Detailed Solution

  •  Cyclopentadienyl anion follows Huckel rule (4n+2), it is aromatic. 
  • Pyridine has 3pi-bonds follows Huckel rule (4n+2), lone pairs of nitrogen are not delocalised in ring, it is aromatic. 
  • Cyclopentadienyl cation do not follow Huckel rule, it is anti-aromatic. 
  • Pyrrole follows Huckel rule, and lone pairs of nitrogen is delocalised in ring hence aromatic. 

Hence, correct option is (C)Question Image

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Which of the following compounds is not aromatic?