Explanation

(c)
Hydroxamic acid test is used to detect 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% $FeCl_{3}$ is added.
Formation of characteristic colour shows the presence of acyl or ester group.
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