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