Compound A is converted to B on reaction with CHCl3 and KOH. The compound B is toxic and can be decomposed by C. A, B and C respectively are :
(1) primary amine, nitrile compound, conc. HCl
(2) secondary amine, isonitrile compound, conc. NaOH
(3) primary amine, isonitrile compound, conc. HCl
(4) secondary amine, nitrile compound, conc. NaOH