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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.
`:. H_(a)` in `(I)` is more acidic since it wil give `H^(o+)` faster to become a stable aromatic anion.
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