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Byju's Answer
Standard XII
Chemistry
Heterolytic Cleavage
The decreasin...
Question
The decreasing order of
p
K
a
value of the following is:
A
I
I
I
>
I
>
I
I
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B
I
I
>
I
>
I
I
I
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C
I
>
I
I
I
>
I
I
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D
I
>
I
I
≡
I
I
I
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Solution
The correct option is
A
I
I
>
I
>
I
I
I
Acidity of these compounds can be explained on the basis of stability of conjugate base.
The conjugate base carbanion of compound III is most stable as the charge is in delocalization and form resonating structures.
Conjugate base of compound II is least stable as it destroys the aromaticity of the compound.
The carbon in
C
H
≡
C
−
is
s
p
hybrid and being electron negative it can hold the charge.
Therefore the order of stability of conjugate base is
I
I
I
>
I
>
I
I
and hence the order of acidic strength is
I
I
I
>
I
>
I
I
.
Stronger the acid lower the value of
p
K
a
. The order of
p
K
a
is
I
I
I
<
I
<
I
I
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The decreasing order of
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Q.
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