Q108 · CSIR-NET Chemistry, December 2015

Paper: CSIR-NET December 2015 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Rotational · Marks: 2 · Difficulty: Medium

The molecule with the smallest rotational constant (in the microwave spectrum) among the following is

(a)$\mathrm{N} \equiv \mathrm{CH}$

(b)$\mathrm{HC} \equiv \mathrm{CCl}$

(c)$\mathrm{CCl} \equiv \mathrm{CF}$

(d)$\mathrm{B} \equiv \mathrm{CCl}$

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

ClC≡CF has the largest moment of inertia — smallest B (c).

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