When a brown compound of Mn (A) is treated with HCI, it gives a gas (B). The gas (B) taken in excess reacts with NH3 to give an explosive compound (C). The compounds A, B and C are
(1) A = MnO, B = Cl2, C = NH4Cl
(2) A = MnO3, B = Cl2, C = NCl2,
(3) A = MnO2, B = Cl2, C=NCl3
(4) A = Mn3O4, B = Cl2, C = NCl3
