A) ketones
B) aldehydes
C) esters
D) amides
Correct Answer: C
Solution :
Hydroxamic acid test is used to detect the presence of esters. In hydroxamic acid test a few crystals or a few drops of the substance is dissolved in 1 mL of 95% ethanol + 1 mL of \[1\text{ }M\,HCl\]. Then, a drop of 5%\[FeC{{l}_{3}}\]is added. Formation of characteristic colour shows the presence of acyl or ester group. \[R-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-OR+{{H}_{2}}NOH\xrightarrow[{}]{{}}R-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-NHOH\]\[\xrightarrow{FeC{{l}_{3}}}\left( R-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-NOH \right)Fe\]
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