Organic Chemistry Some Basic Principles and Techniques - Result Question 58
####64. Which one of the following order is correct regarding the $-I$ effect of the substituents ?
[1998]
(a) $-NR_2<-$ OR $>-F$
(b) $-NR_2>-OR>-F$
(c) $-NR_2<-$ OR $<-$ F
(d) $-NR_2>-OR<-F$
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Solution:
- (c) As electronegativity of $N, O & F$ follow the order $N<O<F$ hence based upon electronegative character order of-I effect is $-NR_2<-OR<-$ F.
The atom or group which has more power to attract electrons in comparision to hydrogen is said to have -I effect. Thus higher the electronegativity of atom, stronger will be the -I effect.
