JEE Main 2022 · 30 Jul · Shift 2 · Chemistry Q43

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ChemistrySingle correct+4 / -1Question 43 of 90

Which of the following is unstable?

Cyclobutadiene

Cyclopentadienyl anion

Cycloheptatriene

Benzene

Answer and worked solution

Official answer: A

Cyclobutadiene is planar with 4 π electrons: antiaromatic and highly unstable. The cyclopentadienyl anion and benzene are aromatic; cycloheptatriene is a stable non-aromatic triene.

(A)

Topics:Aromaticity

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JEE Main 2022 · 30 Jul · Shift 2, Chemistry question 43