devarshi-dt-logo

Question:

Which of the following is correct with respect to the -I effect of the substituents?

-NH2<-OR<-F

-NR2<-OR<-F

-NH2>-OR>-F

-NR2>-OR>-F

Solution:

-NH2<-OR<-F is correct order with respect to -I effect of the substituents. F is most electronegative element. It very strongly attracts bond pair of electrons. O is second most electronegative element. It strongly attracts bond pair of electrons. The electronegativity of N is least. It attracts bond pair of electrons. Thus, the electronegativity order is N<O<F. It is the same order as that of -I effect.