Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R.

Assertion A: Boric acid is a weak acid.

Reason R: Boric acid is not able to release H⁺ ion on its own. It receives OH^- ion form water and releases H⁺ ion.

In the light of the above statements, choose the most appropriate answer form the option given below.

At 25°C the standard emf of cell having reactions involving two electrons change is found to be 0.295 V. The equilibrium constant of the reaction is :

Kindly consider the following 

Which of the following will not give ether as product :-

Which is most reactive towards electrophilic aromatic substitution reaction :-

Which one of the following ions is the most stable in aqueous solution ?

(At. No. Ti = 22, V = 23, Cr = 24, Mn=25)