Q.

The decreasing order of acidic character of the following is:I. CH3SH   II. CH3OH    III. H2O    IV. EtOH

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a

I > II > III > IV

b

IV > III > II > I

c

I > III > II > IV

d

III > I > II > IV

answer is A.

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Detailed Solution

Thiols (RSH) are stronger acid than alcoholsMethanol (pKa=15.5) is a stronger acid than H2O (pKa=15.7),but other alcohols are weaker than H2O.So (1) has acidiccharacter.
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The decreasing order of acidic character of the following is:I. CH3SH   II. CH3OH    III. H2O    IV. EtOH