Question

Which one of the following orders is correct regarding the $-I$ effect of the substituents?

• A. $-N{R}_2<-OR>-F$
• B. $-N{R}_2>-OR>-F$
• C. $-N{R}_2<-OR<-F$
• D. $-N{R}_2>-OR<-F$

Answer 1

The correct option is C $-N{R}_2<-OR<-F$

Alkyl is an electron releasing group has $+I$ inductive effect. $-F$ has $-I$ inductive effect. Oxygen is more electronegative than nitrogen. Therefore the order of $-I$ effect is $-N{R}_2<-OR<-F$