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 MHCl. Then, a drop of 5% \[\text{FeC}{{\text{l}}_{\text{3}}}\]is added. Formation of characteristic colour shows the presence of acyl or ester group. \[R-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-OR+{{H}_{2}}NOH\xrightarrow{{}}R-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-NHOH\] \[\xrightarrow{\text{FeC}{{\text{l}}_{\text{3}}}}\left( R-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-NOH \right)Fe\]
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