In which of the following pairs does the first compound (I) have more resonance energy than the second (II) ?
(A) (I)
(II)
(B) (I)
(II)
(C) (I)
(II)
(D) (I)
(II)

Question

In which of the following pairs does the first compound (I) have more resonance energy than the second (II) ? (A) (I) (II) (B) (I) (II) (C) (I) (II) (D) (I) (II)

TestHub · Accepted Answer

(A) hexatriene is acyclic and has less resonance energy than benzene. (B) The cyclopentadiene with SH has an s p 3 carbon and is not aromatic, but thiophene is aromatic. (C) The cyclopentadienyl anion is aromatic (6π), while the cyclopentyl anion has no conjugation, so (I) has more. (D) The cross-conjugated triene (I) has less resonance than the linear triene (II). So (C).

Chemistry - GOC Question with Solution | TestHub

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