[" A salt gives violet vapours when treated with "],[" conc."H_(2)SO_(4)" It contains "]

Glycerol when heated with conc. H_(2)SO_(4) gives

Violet vapours are not given out when X is/are treated with conc. H_(2)SO_(4) then X may contain:

Acetone on treating with conc H_(2)SO_(4) gives

A mixture when heated with dil H_(2)SO_(4) does not evolve brown vapours but when heated with conc H_(2)SO_(4) , brown vapours are obtained. with AgNO_(3) soin do not give any precipitate .The mixture contain

What happens when:- HCOOH is treated with Conc. H_2SO_4

If sucrose is treated with conc. H_(2)SO_(4) , the product formed is