In each of the following sections four compounds are listed. (Decreasing order of acidic strength, 1 is strongest & 4 is weakest).

Answer

(a) 3 2 1 4 ; (b) 2 1 4 3 ; (c) 3 1 2 4 ;(d) 3 4 1 2

Explanation

(A) Acidic strength `prop -I,-M` stability of conjugate base.

Acidic strength `prop (1)/("distance of group from reaction centre")`
(B) Acidic strength `prop` No of -I groups `prop (1)/(+I)`
a-3,2,1,4 , b-2,1,4,3'c-2,1,3,4 , d-2,4,3,1