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

Answer:

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 .

Answer 2

The pure rotational microwave absorption spectrum has been possessed by HCl and $\rm \bold{CH_3Cl}$.

Pure rotational microwave absorption has been consisted of the molecules having dipole and polarizability. The molecules that show the spectrum and dipole are diatomic molecules, linear molecules, spherical molecules.

(i) The hydrogen has been a diatomic molecule with symmetry thus not showing a pure rotational microwave absorption spectrum.

(ii) The HCl being a linear molecule possesses a pure rotational microwave absorption spectrum.

(iii) $\rm CH_4$ molecule has symmetry, thus will not possess a  pure rotational microwave absorption spectrum.

(iv) $\rm CH_3Cl$ molecule has no symmetry, and thus possesses a  pure rotational microwave absorption spectrum.

(v) $\rm CH_2Cl_2$ molecule with the presence of symmetry, thus lacks a pure rotational microwave absorption spectrum.

For more information about the pure rotational microwave absorption spectrum, refer to the link:

https://brainly.com/question/14215380