Clear organe solution of chromic anhydride in aqueous sulpuric acid turn blue-green on reaction with

A compound is soluble in conc. H_2SO_4 . It does not decolourise bromine in carbon tetrachloride but is oxidised by chromic abhydride in aqueous sulphuric acid with in two seconds, turning orange solution to blue, green and then opaque. The original compound is

A compound is soluble in conc. H_(2)SO_(4) . It does not decolourise bromine in carbon tetrachloride but oxidised by chromic anhydride in aqueous sulphuric acid within two seconds, turning organge solution to blue, green and then opaque. The original compound is :

The compound which does not change the orange colour of chromic acid (i.e. chromic anhydride in H_(2)SO_(4) ) to blue green is :