b
Lassaigne's test is used for the detection of nitrogen and given by all nitrogenous compound except diazo \(\rlap{-} (\,\,N = N\rlap{-} )\) compounds. This test is shown only by the compounds containing \(C\) and \(N\) both hence hydroxyl amine hydrochloride \((H_2NOH .HCl)\) will not perform this test