CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323468
In the given compound, which of the following hydrogen is most acidic?
1 Only A
2 Only B
3 Only C
4 Both B and C
Explanation:

This compound undergoes enolisation by the following mechanism.

Thus, hydrogen B is most acidic as it is attached with the active methylene group.