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the carbonyl stretching frequency of p-nitroacetophenones is greater than p-aminoacetophenone in the ir region. why?

alibha sahu , 7 Years ago
Grade 12th pass
anser 1 Answers
Vikas TU

Last Activity: 7 Years ago

It is obvious the stretching would b more in p-nitroacetophenones than p-aminoacetophenones as at 1 and 4 position of benzene the two strong -M groups temds to absorb more electron enrgy that is the elctron density on benzene decreases
as the direction of electron density flow in benzene is opposite and hence it makes the total compound more stretchable.
 

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