The slope of Arrhenius Plot (ln k v/s 1/T) of first order reaction is -5 ⨉ $10^3$ K. The value of $E_{\text{a}}$ of the reaction is. Choose the correct option for your answer. [Given R = 8.314 $\text{JK}^{-1}$ $\text{mol}^{-1}$]