Rank the hydrogen atoms $(H_{a}, H_{b}, H_{c})$ in the following molecule according to their acidic strength.

a > b > c

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b > a > c

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b > c > a

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c > b > a

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Solution

The correct option is D $c > b > a$
$H_{c}$ is in conjugation with $2 - c a r b o n y l$ group. Hence it has the highest acidic strength.
Similarly, $H_{b}$ is in conjugation with one carbonyl group.
There is no such stabilizing factor in $H_{a}$
Order of acidic strength is $c > b > a$

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