Which is the most suitable reagent among the following to distinguish compound (ii) from rest of the compounds
(i)`CH_3-C-=C-CH_3`
(ii)`CH_3-CH_2-CH_2-CH_3`
(iii)`CH_3-CH-C-=CH`
(iv)`CH_3-CH=CH_2`
A. Bromine in carbon tetrachloride
B. Bromine in acetic acid
C. Alkaline `KMnO_4`
D. Ammoniacal silver nitrate reagent