Question

Strength of acid increases with the attachment of group showing –I effect and decreases with the attachment of group showing +I effect. Which of the following is correct sequence of basic strength in aqueous solution ?

(a) CH₃NH₂ < (CH₃)₂NH < (CH₃)₃N

(b) (CH₃)₂NH < CH₃NH₂ < (CH₃)₃N

(c) (CH₃)₃N < (CH₃)₂NH < CH₃NH₂

(d) (CH₃)₃N < CH₃NH₂ < (CH₃)₂NH

Answer 1

Correct Option (d) (CH₃)₃N < CH₃NH₂ < (CH₃)₂NH

Explanation :

Such order of basic strength is weighted result of these three factors

(a) Inductive effect 

(b) Solvation effect

(c) Steric hindrance