Q41 · CSIR-NET Chemistry, June 2021

Paper: CSIR-NET June 2021 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Molecular Spectroscopy – General · Marks: 2 · Difficulty: Medium

The molecule that will not absorb in the microwave region, but will absorb in the infra-red region
(a)$\mathrm{N}_{2}$
(b)$\mathrm{C}_{2} \mathrm{H}_{2}$
(c)HCl
(d)$\mathrm{H}_{2} \mathrm{O}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
C₂H₂ has no permanent dipole (no microwave spectrum) but has IR-active asymmetric modes; N₂ is inactive in both, HCl and H₂O are active in both (b).

Study loop for Molecular Spectroscopy

1. Practise the PYQsPrevious-year questions, with answers

· Browse this chapter in the app