For conversion of compound A → B, the rate constant of the reaction was found to be 4.6 × 10^-5 L mol^-1 s^-1. The order of the reaction is ____.

For conversion of compound $\displaystyle \mathrm{A} \rightarrow \mathrm{B}$, the rate constant of the reaction was found to be $\displaystyle 4.6 \times 10^{-5} \mathrm{~L} \mathrm{~mol}^{-1} \mathrm{~s}^{-1}$. The order of the reaction is $\displaystyle \_\_\_\_$.