Ketone P (having minimum molar mass) on reaction with ${\mathrm{NH}}_2\mathrm{OH}$ form two oxime Q and R that are geometrical isomer (P contain only C, H and O )

$$\begin{gathered} \mathrm{Q}\stackrel{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }\underset{\mathrm{V}}{\mathrm{Amide}}\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right) \mathrm{Basic} \mathrm{hydrolysis}}{\to }}\underset{\mathrm{I}}{\mathrm{Acid}}+ \mathrm{Amine} \\ \mathrm{R}\stackrel{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }\underset{\mathrm{w}}{\mathrm{Amide}}\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right) \mathrm{Basic} \mathrm{hydrolysis}}{\to }}\underset{\mathrm{II}}{\mathrm{Acid}}+ \mathrm{Amine} \end{gathered}$$

The difference in molar mass of Acid I and II is