Factors determining intensity and energy level of absorption in IR spectra

Factors determining intensity and energy level of absorption in IR spectra 

The intensity with which a bond absorbs radiation depends on its dipole moment. Thus the order of intensity of absorption for the following C-X bonds is  

The intensity depends on the relative electronegativity of the atoms involved in the bond. 

Predict the order of intensity of absorption of the following bonds  

The intensity of the stretching of carbon-carbon double bonds is increased when they are conjugated to a polar double bond and such bonds in the A ring of the corticosteroids are quite prominent (e.g. see Fig. 5.12). 

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