Question

What are the essential condition for a molecules to be ir active?

Answer 1

Answer:

For a molecule to be IR active there must be a change in dipole moment as a result of the vibration that occurs when IR radiation is absorbed. Dipole moment is a vector quantity and depends on the orientation of the molecule and the photon electric vector. The dipole moment changes as the bond expands and contracts

Explanation:

Answer 2

Answer:

For a molecule to be IR active, it should have a variable dipole moment.

Explanation:

Dipole Moment is the vector quantity and it changes as the vibration occurs when the IR is absorbed. The dipole moment is a vector quantity and it changes when there is expansion and contraction of the bond.