An organic compound (A) reacts with HCN to give (B). On hydrolysis of (B) in acidic medium gives (C). Compound (A) also produces propane when treated with zinc-amalgam and HCl. Identify (A), (B) and (C) with reaction and give their IUPAC names. What product would you expect when A is treated with trichloromethane in alkaline medium.​