153. Which of the following is correct with respect to
— I effect of the substituents? (R = alkyl)
(1) - NH2 < -OR < -F
(2) - NR2 < - OR < -F
(3) - NR2 > - OR > -F
(4) -NH2 > -OR > -F
@anchal
-I - effect (Negative inductive effect) -
Those atoms or group of atoms having more tendency to displace e - towards itself as compared to Hydrogen atom is called Negative Inductive effect
- wherein

Based on electronegativity
— NH2 < — OR < — F
or
— NR2 < — OR < — F
-I effect H3C-NH2 3 C NH H3C 2 C