Question

Which of the following could happen when infrared radiation is absorbed by a molecule ?

Answer 1

Answer:

       E) Intramolecular bond angles change

Explanation:

Infrared Radiation:

IR is electromagnetic radiations. The wavelength i.e. 700nm to 1000 mm of infrared is longer than invisible light and Its frequency is lower than light, that's why it is invisible to light.

• When IR radiation strike the molecule it absorbed by this molecule.

• This radiation used to identify and study chemicals.

• Infrared radiation interact with intra-bonds of the molecule.

• Bonds in the molecules have vibrational translational and rotational movements
• Due to these vibration, rotation and translation movement it absorb a radiation of specific frequency and wavelength
• These movements of bond are very small and absorbs radiations of very low frequency
• So when Infrared light or radiation absorbed the intra-bonds of the molecule get affected and angles of these bonds changes.
• As the frequency of the absorbed radiation matches the frequency of the bond that vibrates.

So

The correct option is option E

       E) Intramolecular bond angles change

* Note:

it couldn't be option A as the frequency of IR is not enough to rotate a whole molecule

It Couldn't be option B as IR rations are electromagnetic radiation of longer wave length so it one can not see it with light so how it will glow a molecule

It also not could be the option C as for the excitation of electrons require much higher energy.

It also not the option D as nuclear magnetic spin is associated with nuclear magnetic radiation that are much different from IR.