Question

The decreasing order of acidic character of the following is :
(I) `CH_3 SH`
(II) `CH_3 OH`
(III) `H_2 O`
(IV) `EtOH`.
A. `I gt II gt III gt IV`
B. `IV gt III gt II gt I`
C. `I gt III gt II gt IV`
D. `III gt I gt II gt IV`

Answer 1

Correct Answer - A
(a) Thiols `(RSH)` are stronger acid than alcohols Methanol `(pK_a = 15.5)` is a stronger acid than `H_2 O(pK_a = 15.7)`, but other alcohols are weaker than `H_2 O`. So `(a)` has acidic character.