Name the reagents used in the following reactions:
(i)Oxidation of a primary alcohol to carboxylic acid.
(ii)Oxidation of a primary alcohol to aldehyde.
(iii)Bromination of phenol to 2,4,6-tribromophenol.
(iv)Benzyl alcohol to benzoic acid.
(v)Dehydration of propan-2-ol to propane.
(vi)Butan-2-one to butan-2-ol.