Q68 · CSIR-NET Chemistry, June 2018

Paper: CSIR-NET June 2018 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Molecular Spectroscopy – General · Marks: 2 · Difficulty: Easy

A symmetric top molecule, among the following, is
(a)Ethylene
(b)Allene
(c)butatriene
(d)Hexatriene
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Allene (D₂d) has a C₂ axis along C=C=C with two equal moments of inertia — a symmetric top; ethylene, butatriene and hexatriene are asymmetric tops.

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