In each of the following sections four compounds are listed. In the box under each formula enter a number (1 to 4) indicating the order of acid strength (1 is strongest & 4 is weakest).

Answer

`a-4,2,3,1; b -3,1,4,2;1,3,4;d -2,3,4,1`

Explanation

Acidic strength `prop -I`
Acidic strength `prop (1)/("distance of group from reaction centre")`
(b) Acidic strength oc Stability of conjugated base.
(c)
(d) Stability of conjugated base.