Discussion
The molecule that does NOT absorb the microwave radiation is
Answer: A
The molecule that does not absorb microwave radiation is CO\(_{2}\).
A pure rotational (microwave) spectrum needs a permanent electric dipole moment, so that the rotating molecule presents an oscillating dipole to the radiation. CO2 is linear and symmetric, O=C=O, and its two bond dipoles cancel, so it has no permanent dipole and shows no microwave spectrum.
H2O is bent and strongly polar, and the heteronuclear diatomics CO and NO each have a permanent dipole, so all three absorb in the microwave region.
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