The compound 'A' decolourises ` Br_2 // "CCl"_4` and releases `N_2` gas with `HNO_2` . The compound 'A' is

An optically active compound (A) decolourises Br_(2)//C Cl_(4) and releases N_(2) with nitrous acid. The compound A is:

The compound that decolourises alk. KMnO_4 is

The compound that decolourises alk. KMnO_(4) is

The compound that decolourises alkaline KMnO_(4) is :-

An organic compound decolorizes Br_2 water and also gives red ppt. with Cu_2Cl_2 solution the compound is