Question

Which one of the following exhibits rotational spectra ?
1. H2.
2. N2.
3. CO.
4. CO2

Answer 1

Answer:b

Explanation:

Answer 2

CO exhibits rotational spectra.

• The molecules which have a permanent dipole moment can exhibit rotational spectra.
• Hydrogen, nitrogen and carbon dioxide are non-polar molecules and they do not possess dipole moment. So, these molecules do not give rotational spectra.
• CO is a polar molecule and has a permanent dipole moment so, it exhibits rotational spectra.
• Hence the correct option is 3.