For the reaction CH3COCH3 + I2 H ->Products, the rate is governed by the expression dx k dt [Acetone] [H+] The order w.r.t. iodine is

Rate law is Acetone dx k H dt i.e., Acetone R k H Since, Iodine is not mentioned in the rate law, rate is independent of 2I Thus, rate w.r.t. 2I shows zero-order.