The absorption lines arising from pure rotational effects of HCl are observed at 83.03 cm−1, 103.73 cm−1, 124.30 cm−1, 145.03 cm−1 and 165.51 cm−1. The moment of inertia of the HCl molecule is (take \(\rm\frac{h}{2 \pi c}\) = 5.6 × 10−44 kg-m)
1
1.1 × 10−48 kg-m2
2
2.8 × 10−47 kg-m2
3
2.8 × 10−48 kg-m2
4
1.1 × 10−42 kg-m2
5
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