Chapter 14, Problem 14.23E

Which of the following molecules should have pure rotational spectra?

(a) Deuterium, ${\text{D}}_{\text{2}}$ ( $\text{D}$ is ${}^2\text{H}$)

(b) Carbon monoxide, $\text{CO}$

(c) $cis-1,2-\text{Dichloroethylene}$

(d) $trans-1,2-\text{Dichloroethylene}$

(e) Chloroform, ${\text{CHCl}}_{\text{3}}$

(f) Buckminsterfullerene, ${\text{C}}_{\text{60}}$