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Question

Use resonance arguments to rank the above in order of increasing acidity :

805451_b061d20afcb149a1a120fa3a448b8018.png

A
Hc<Ha<Hb
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B
Ha<Hb<Hc
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C
Hb<Hc<Ha
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D
Hc<Hb<Ha
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Solution

The correct option is A Hc<Ha<Hb
In the given structure Ha is present next to C=O,

Hb is in conjugation with C=C and that extends to C=O

Hc has no conjugation.

Therefore Hb is most acidic and Hc is least acidic

Therefore the order of acidity is :

Hb>Ha>Hc

Option A is correct.

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