The order of reaction is an experimentally determined quanity. It may be zero, poistive, negative, or fractional. The kinetic equation of `nth` order reaction is`k xx t = (1)/((n-1))[(1)/((a-x)^(n-1)) - (1)/(a^(n-1))]` …(i) Half life of `nth` order reaction depends on the initial concentration according to the following relation: `t_(1//2) prop (1)/(a^(n-1))` ...(ii) The unit of the rate constant varies with the order but general relation for the unit of `nth` order reaction is Units of `k = [(1)/(Conc)]^(n-1) xx "Time"^(-1)` ...(iii) The differential rate law for `nth` order reaction may be given as: `(dx)/(dt) = k[A]^(n)` ...(iv) where `A` denotes the reactant. In a chemical reaction `A rarr B`, it is found that the rate of the reaction doubles when the concentration of `A` is increased four times. The order of the reaction with respect to `A` is:A. `0`B. `(1)/(2)`C. `1`D. `2`