Q73 · CSIR-NET Chemistry, December 2017

Paper: CSIR-NET December 2017 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Molecular Spectroscopy – General · Marks: 2 · Difficulty: Easy

The pair that contains a spherical top and a symmetric top, among the following, is

(a)$\mathrm{CH}_{4}, \mathrm{CH}_{2} \mathrm{Cl}_{2}$

(b)$\mathrm{CH}_{2} \mathrm{Cl}_{2}, \mathrm{CH}_{3} \mathrm{Cl}$

(c)$\mathrm{CH}_{3} \mathrm{Cl}, \mathrm{CH}_{4}$

(d)$\mathrm{CH}_{4}, \mathrm{C}\left(\mathrm{CH}_{3}\right)_{4}$

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

CH₄ (and CCl₄, C(CH₃)₄) are spherical tops; CH₃Cl is a symmetric top; CH₂Cl₂ is asymmetric. The pair CH₃Cl, CH₄ contains one of each.

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