Discussion
Following test is a confirmatory test for phenol
Answer: A
The confirmatory test for phenol among the options is Ware's nitrite test. The Cobalt thiocyanate test is the Scott test for cocaine, Vitali's test is used for atropine and the other tropane alkaloids, and the Marquis test is the colour test for opiates and amphetamines. Since the other three are tests for other drugs, the answer is A. The Marquis reagent is formaldehyde in sulphuric acid and gives colours with opiates and amphetamines, and Vitali's test is a reaction of the tropane alkaloids with fuming nitric acid and alcoholic potash. Because each of the other three has a different target substance, the nitrite test is the one that goes with phenol.
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