Concept of Aromatic compounds


Which of the following molecules, in pure form, is (are) unstable at room temperature ?

(a) A

(b) B

(c) C

(d) D


Order of stability is Aromatic > Non aromatic > Anti Aromatic.

Compound !!B!! and !!C!! are anti aromatic compounds because they have !!4n!! number of !!pi!! electrons conjugating in the ring. Compound !!A!! is non-aromatic because it as a !!sp^3!! hybridised carbon (non planar) while the the compound !!D!! is aromatic !!( 4n + 2)!! !!pi!! electrons conjugating in a planar ring.

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