$\mathrm{RCOOR}+{\mathrm{H}}_2\mathrm{O}\stackrel{\mathrm{HCI}}{\to }\mathrm{RCOOH}+\mathrm{ROH}$
follows____________ reaction kinectics

$$\begin{gathered} {\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}+{\mathrm{H}}_2\mathrm{O}\stackrel{{\mathrm{H}}^{+}}{⟶}{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6+{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6 \\ \text{ Rate }=\mathrm{k}\left[{\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}\right]\left[{\mathrm{H}}_2\mathrm{O}\right] \end{gathered}$$

When water is present in excess, then the concentration of water is not considered.

$\therefore \text{ Rate }={\mathrm{k}}^{\mathrm{\prime }}\left[{\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}\right]$

So, the given order is pseudo unimolecular reaction.