In some cases, an epoxide is used instead of the alcohol; or an acid halide or anhydride replaces the acid. Less often, an alkyl or aryl halide is treated with a carboxylate salt. But these methods ...

Sulfuric acid, H 2 SO 4 (aq), contains sulfate ions. These would react with barium ions in the test, giving an incorrect positive result. Explain why, in a test for halide ions, the sample is ...