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The decreasing order of acidic character...

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`

Text Solution

Verified by Experts

The correct Answer is:
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.
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Knowledge Check

  • The decreasing order of acidic character of the following is : (I) CH=CH .

    A
    `I gt II gt III`
    B
    `II gt I gt III`
    C
    `III gt II gt I`
    D
    `I gt III gt II`

  • The decreasing order of acidic character of the following is: (I) (II) (III) (IV)

    A
    `II gt IV gt III gt I`
    B
    `I gt III gt IV gt II`
    C
    `IV gt II gt I gt III`
    D
    `III gt I gt II gt IV`

  • The decreasing order of the basic character of the following is : (I) F^(Ө) (II) NO_3^(Ө) (III) H_2 O (IV) CH_3 OH .

    A
    `(II) gt (I) gt (IV) gt (III)`
    B
    `(III) gt (IV) gt (I) gt (II)`
    C
    `(I) gt (II) gt (III) gt (IV)`
    D
    `(IV) gt (III) gt (II) gt (I)`

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