The relationship between the values of osmotic pressures of 0.1 M solutions of ${\mathrm{KNO}}_3\left({\mathrm{P}}_1\right)$ and ${\mathrm{CH}}_3\mathrm{COOH}\left({\mathrm{P}}_2\right)$ is 

For equimolar solution, osmotic pressure depends on the value of van't Hoff factor (i) 

$\therefore$ Osmotic pressure $\propto \mathrm{i}$

For $KN{O}_3$ (being strong electrolyte), completely ionizes, ${\mathrm{i}}_1=2$

But for ${\text{CH}}_3\mathrm{COOH},\mathrm{\hspace{0.17em}}{\mathrm{i}}_2=1+\propto$

${\text{∴\hspace{0.17em}i}}_1>{\mathrm{i}}_2 \mathrm{But} {\mathrm{P}}_1<{\mathrm{i}}_1$

$\begin{array}{l}{\mathrm{P}}_2<{\mathrm{i}}_2\\ \therefore \mathrm{\hspace{0.17em}}{\mathrm{P}}_1>{\mathrm{P}}_2\end{array}$