JEE Main 2022 · 26 Jul · Shift 1 · Chemistry Q73 · Dronacharya Exams

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ChemistrySingle correct+4 / -1Question 73 of 90

Which of the following compounds is not aromatic ?

A

Cyclopentadienyl anion

Cyclopentadienyl anion: five-membered ring with two C=C and a negative charge.

B

Cyclopropenyl cation

Cyclopropenyl cation: three-membered ring with one C=C and a positive charge.

C

[10]Annulene with two inward-pointing H atoms

[10]Annulene drawn with two inner hydrogens that clash, forcing the ring out of plane.

D

Naphthalene

Naphthalene: two fused benzene rings.

Answer and worked solution

Official answer: C

[10]Annulene with two inner hydrogens cannot be planar, so it is not aromatic.

(C)

Topics:Aromaticity

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