State the rule of mutual exclusion | Raman Spectra | Physical Chemistry

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If a molecule has a centre of symmetry then Raman active vibrations are IR Inactive and vice versa. e.g. CO2. For CO2 none of the vibrations is simultaneously active in both IR and Infrared. CO2 has the centre of symmetry.
In molecules having inversion centre, none of the normal modes of vibrations will be both Raman and IR active. This is known as “mutual exclusion principle”. A simple molecule which obeys this principle is CO2. Carbon dioxide has an inversion centre or centre of symmetry
If a molecule has no Center of symmetry then some but not necessarily all vibrations may be both IR and Raman active. e.g H2O.
In molecules having inversion centre, none of the normal modes of vibrations will be both Raman and IR active. This is known as “mutual exclusion principle”. A simple molecule which obeys this principle is CO2. Carbon dioxide has an inversion centre or centre of symmetry
The converse of the rule is also true i.e. if for a molecule both IR and Raman spectra do not have common lines, and the molecule has a centre of symmetry.
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[@Textorix]

Can you please explain why with linear molecule there is no change in polarisability with asymmentrical stretching while with molecule that has no centre of symmetry asymmetrical strething does change polarisability?

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what does dipole moment mean?

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