Question

The increasing order of electron donating inductive effect of alkyl group is :

• A. $-H<-{CH}_3<-C_2{H}_5<-C_3{H}_7$
• B. $-H>-{CH}_3>-C_2{H}_5>-C_3{H}_7$
• C. $-H<-C_2{H}_5<-{CH}_3<-C_3{H}_7$
• D. $-H>-C_2{H}_5>-{CH}_3>-C_3{H}_7$

Answer 1

The correct option is A $-H<-{CH}_3<-C_2{H}_5<-C_3{H}_7$

• Electron donating effect ($+I$ effect) increases with increasing number of alkyl groups.

Order of $+I$ effect : $-H<-C{H}_3<-C_2{H}_5<-C_3{H}_7$