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Which of the following will have lower p...

Which of the following will have lower `pK_(a)` value?

A

`H_(a)`

B

`H_(b)`

C

`H_(c)`

D

`H_(d)`

Text Solution

Verified by Experts

The correct Answer is:
A

The order of Aromatic stability is : Aromatic `gt` Non-aromatic `gt` Anti-aromatic
`(I)gt(II)gt(IV)gt(III)`
(IV) has more resonating structures than (III), and is, therefore, more stable.
`thereforeH_(a)` in (I) is more acidic since it will give `H^(o+)` faster to because a stable aromatic anion.
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