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Explain why CHF,C1 (HCFC-22) has more IR absorption bands with a greater range of IR wavelengths...

Explain why CHF,C1 (HCFC-22) has more IR absorption bands with a greater range of IR wavelengths absorbed, and absorbs IR much more efficiently on a per molecule basis, than CH4, the hydrocarbon from which it is derived.

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Answer #1

IR spectra work on the principle of the study of rotation and transition induced in the molecule by absorption of infrared light.

The peaks in transmittance are given by interaction of a functional group with IR light.

Higher the net dipole moment of a molecule is, more absorption would occur and more pronounced peaks would be observed.

HCFC-22 (CHF2Cl) molecule is highly unsymmetrical and has high dipole moment than CH4 , that is why it covers a larger area of IR band and absorbs more efficiently.

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