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Question

Arrange the marked hydrogens (a, b and c) in increasing order of their acidic strength :


A
(c) > (b) > (a)
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B
(a) > (b) > (c)
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C
(b) > (a) > (c)
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D
(a) > (c) > (b)
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Solution

The correct option is C (b) > (a) > (c)
Acidic strength will depend on stability of conjugate base formed. Stable the conjugate base, more is the acidity.
When hydrogen (a) is lost :


When hydrogen (b) is lost :


When hydrogen (c) is lost :

Since, there is no conjugation in (c), so, it is the least stable conjugate base.
Between (a) and (b) :
(b) has extended conjugation while (a) doesn't have extended conjugation. So, conjugate base when hydrogen (b) is lost, it is more stable.
Correct order of stability :
(b) > (a) > (c)


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