Question

Which of the following molecules may show a pure rotational microwave absorption spectrum: (i) H2, (ii) HCl, (iii) CH4, (iv) CH3Cl, (v) CH2Cl2?

Answer 1

Step-by-step explanation:

H₂ , HCl , CH₃Cl , CH₂Cl₂ ---- Yes

CH₄ ------ No .

Symmetric molecules do not have rotational microwave absorption spectrum because they do not possess permanent dipole moment so they lack polarisability .