Question

11. Interaction of I.R. with molecule brings about change in
a) rotational motion only,
b) vibrational motion only
c) rotational and vibrational motions d) spin of electron​

Answer 1

option (a) is correct may this help you

Answer 2

Solution:

'b) Vibrational motion only' is the correct answer.

Explanation:

• Absorption of infrared radiation brings about changes in molecular vibrations within molecules and ‘measurements’ of the ways in which bonds vibrate gives rise to infrared spectroscopy.

• Atom size, bond length and bond strength vary in molecules and so the frequency at which a particular bond absorbs infrared radiation will be different over a range of bonds and modes of vibration.