1.

Account for the acidity of L-ascorbic acid (pK_(a)=4.21). Which of the following is most acidic H? (Marked in the structure as H^(a),H^(b),H^(c ) "and" H^(d))

Answer»

`H^(a)`
`H^(B)`
`H^(c )`
`H^(d)`

Solution :The anion FORMED by the REMOVAL of enolic `H` is stable because the negative charge is STABILISED by resonance, i.e., by delocalisation of the negative charge to the `O` of the `(C=O)` through `(C=C)`, as shown below.


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