Question

20. Homonuclear diatomic molecules are often found to be
a) microwave active b) R active c) uv active d) Raman active
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Answer 1

Answer:

Diatomic molecules have quantized energy levels for rotation and vibration. The halogen series contains many homonuclear diatomic molecules. Hydrogen, nitrogen, and oxygen are stable homonuclear diatomic molecules.

Answer 2

Answer:

Correct option - (d) Raman active.

Homonuclear diatomic molecules are Raman active

Explanation:

If a molecule has two atoms both of which have similar nuclear composition, then it is known as a homonuclear diatomic molecule. The most common examples are hydrogen ($H_{2}$), Nitrogen ($N_{2}$), and Oxygen ($O_{2}$).

Homonuclear diatomic molecules have the property of changing polarizability. This property is the result of changes in the interaction of the electrons and nuclei which in turn is a result of stretching and contraction of bonds. This shows that the homonuclear diatomic molecules are found in Raman active. They cannot be IR active because they have no dipole moment. They are rotationally and vibrationally inactive. Thus, they are neither microwave active nor UV active.

So, the correct answer is: Homonuclears diatomic molecules are often found to be RAMAN active.