Location of double bond in unsaturated hydrocarbon can be detected by
Ozonolysis reaction
Bayer's reagent
Br2 in CCl4
Tollen's reagent
Ozonolysis indicates the position & number of double bonds in the compounds
A,B and C are three unsaturated compounds. A and C only can declourise Bayer's reagent. Only 'A' can give precipitate with tollens reagent