Which of the following compounds will give racemic mixture on nucleophilic substitution by OH" ion?
1-Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene
A dihalogen derivative 'X' of a hydrocarbon with three carbon atoms react with ale. KOH and produces hydrocarbon which forms red ppt. with ammonical Cu?Cl?. 'X' gives an aldehyde on reaction with aq. KOH. The compound 'X' is