Question

Which of the following molecules would show rotational spectrum:
Br2 , HBr and CS2? Why?

Answer 1

Answer:

HBr

Explanation:

HBr is a polar molecule and it has dipole moment. That's why it show rotational spectrum

Answer 2

HBr shows a rotational spectrum.

• The molecules which possess a dipole moment can give a rotational spectrum.
• Bromine is a homonuclear diatomic molecule that is nonpolar so, it can not show a rotational spectrum.
• HBr is a polar molecule so, it possesses a dipole moment and can show a rotational spectrum.
• Carbon disulfide has zero dipole moment due to linear structure so, it can not show a rotational spectrum.