Chromium oxychloride reacts violently on phenol, producing hydroquinone ether, O(C 6 H 4 OH)2; chromic acid gives phenoquinone, and potassium permanganate gives paradiphenol, oxalic acid, and some salicylic acid (R.   anvd [Please select]

Expose under magnesium light and develop with a citrate oxalic developer, or in the following hydroquinone developer: Hydroquinone.   anvd [Please select]