Which of the following compounds will react with sodium hydroxide solution in water?

I. C₆H₅OH

II. C₆H₅CH₂OH 

III. (CH₃)₃COH

IV. C₂H₅OH 

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)