Question

For which of the following molecules could a pure rotational spectrum not be observed in the gas phase?
HCl
CO
N2
NO

Answer 1

Answer:

N2

Explanation:

N2 don't have dipole moment

Answer 2

Concept introduction:

A spectrum is a situation that may fluctuate over a continuum without gaps and is not confined to a certain set of values. The term was initially used in optics to express the rainbow of colors produced by visible light passing through a prism.

Explanation:

We have to answer the following question.

A question has been given to us.

$N_{2}$  molecules could a pure rotational spectrum not be observed in the gas phase. Because it has no dipole moment.

Final answer:

Hence, the final answer of the question is-> $N_{2}$.

#SPJ3.