The molecule that possesses symmetry S₄ element is

Q101 · CSIR-NET Chemistry, December 2011

Paper: CSIR-NET December 2011 · Subject: Physical Chemistry · Chapter: Group Theory · Topic: Group Theory – General · Marks: 2 · Difficulty: Easy

The molecule that possesses symmetry $\mathrm{S}_{4}$ element is

(a)ethylene

(b)allene

(c)benzene

(d)1,3-butadiene

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

Allene (D₂d) has an S₄ axis along the C=C=C line; ethylene and butadiene have S₂ (= i) only and benzene has S₆ and S₃ but its S₄ does not exist.

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