Among the following which one will not be soluble in `NaHCO_(3)`
(A) 2 4 6- trinitropheol ,
(B) Benzoic acid
(C) o- nitro phenol
(D) Benzene sulphonic acid

Amongst the following phenols which one is most acidic ?

Among the following phenols which is most acidic?

At which of the following reaction condition phenol gives O-phenol sulphonic acid ?

Out of the following compounds which produce CO_(2) gas when treated with NaHCO_(3) ? (i) Phenol (ii) 2, 4, 6-Trinitrophenol (iii) Acetic acid (iv) 2, 4, 6-trimethylphenol. (v) Ethyl alcohol.

Arrange the following acids in order of the increasing acidity: A= o-nitro benzoic acid, B = p-nitro benzoic acid, C= p-hydroxy benzoic acid, D= benzoic acid