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The main confusion is between the compound (a) and compound (b) because in compound (c) we get aromatic ring(above) upon cleavage of double bond on N so it must be best whereas in compound (d) we get an anti aromatic ring (above ) so it must be least but what about coumpound (a) and (b).

Shresth Jain
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  • A positively charged species is unlikEly to attract H+ – Waylander Sep 10 '18 at 11:42
  • The stability of the conjugate acid in case of a) is lesser than that of b), because of the increased electron withdrawing effects of N atom. – Soumik Das Sep 10 '18 at 11:55
  • After the cleavage of the double bond between N and Upper ring , the positive charge of the nitrogen will no longer be there so it will the surely attract H+ @Waylander – Shresth Jain Sep 10 '18 at 17:49

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