Q.

Which of the following is the correct order of stability of the given compounds?

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a

(I) > (II) > (III)

b

(III) > (II) > (I)

c

(II) > (I) > (III)

d

(II) > (III) > (I)

answer is A.

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Detailed Solution

(I) ⇒ Aromatic 6πe¯ 's system in conjugation (II) ⇒Non-aromatic, 8πe-'s system but ring is not planar, so not anti-aromatic but non-aromatic.(III) ⇒ Anti-aromatic 8πe-'s in conjugation Stability order: Aromatic > Non-aromatic > Anti-aromatic.(I)>(II)>(III).
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Which of the following is the correct order of stability of the given compounds?