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Q. Hydroxamic acid test is employed to detect

J & K CETJ & K CET 2008Aldehydes Ketones and Carboxylic Acids

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 $1\, M\,HCl$.
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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