A hydrocarbon ' A ', (C₄H₈) on reaction with HCl gives a compound ' B ' (C₄H₉Cl), which on reaction with 1 mol of NH₃ gives compound ' C ', (C₄H₁₁ N). On reacting with NaNO₂ and HCl followed by treatment with water, compound ' C ' yields an optically active alcohol, ' D '. Ozonolysis of ' A ' gives 2 moles of acetaldehyde. Identify compounds 'A' to 'D'. Explain the reactions involved.

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)