Which of the following rate laws suggests that the reaction probably occurs in a single step?

Question

NO(g) + O2(g) → NO2(g) + O(g) rate = k[NO][O2]



H2O2 + 3 I- + 2 H+→ I3- + 2 H2O rate= kl[H2O2][I-]+K2[H2O2][I-][H+]



H2(g) + Br2(g) → 2 HBr(g) rate = k[H2][Br2]1/2



(CH3)3CBr + OH- →(CH3)3COH + Br- rate = k[(CH3)3CBr]