Does picric acid contain a carboxyl group ?

Citric acid contains X carboxylic groups and Y hydroxy groups. Value of X+Y is

Assertion : Carboxylic acids contain a carbonyl group but donot give the characteristic reactions of the group. Reason : The electrophilicity of the carbon atom is more in carboxylic acids than in aldehydes and ketones.

Picric acid is

Picric acid is

Picric acid is