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

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

The decreasing order of acidic character of the following is: (I) EtOH (II) Me-COOH MeOOC-H_(2)-COOMe (IV)

The decreasing nucleophilicity of the following is : (I) CH_3 S^(Ө) (II) CH_3 O^(Ө) (III) overset (Ө) O H (IV) EtO^(Ө) .

The decreasing basic character of the following is : (I) Ph O^(Ө) (II) CH_3 S^(Ө) (III) overset (Ө) O H (IV) MeO^(Ө) .

The decreasing order of acidic character of the following is : (I) p-Nitrophenol (II) o-Nitrophenol (III) m-Nitrophenol (IV) Phenol.

Explain the following : (a) In gaseous phase, the acidic characters of the following are : (i) CH_3 CH_2 COOH (I) gt CH_3 COOH (II) (ii) ClCH_2COOH (III) gt FCH_2 COOH (IV) (iii) Me_3 C-OH (V) gt MeCH_2 CH_2 CH_2 OH (VI) . (b) Account for the following differences in the acidic characters of the following : (i) (I) Me_3 C-CH_2 -COOH gt (II) Me_3 SICH_2 COOH (ii) (III) H_2 C = CHCH_2 COOH gt (IV) CH_3 CH_2 COOH (iii) (V) HC -= C - CH_2COOH (pK_a 3.22) gt (VI) H_2 C = CH CH_2 COOH (pK_a = 4.35) (iv) CH_(3)-underset(O)underset(||)(C)-CH_(2)-COOH gt (v) (IX) N -= C - CH_2 COOH gt (X) CH_3 COCH_2 -COOH (vi) (XI) PhCh_2 COOH gt (XII) CH_2 = CHCH_2 COOH .

The decreasing order of + I effect of the following is : (I) - O^(Ө) (II) Me- (III) Et- (IV) Me_2CH- (V) Me_3 C- .

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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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