Mechanism of a hypothetical reaction X2 + Y2 → 2XY is given below :-
(i) X2 ⇌ X + X (fast)
(ii) X + Y2 → XY + Y (slow)
(iii) X + Y → XY (fast)
The overall order of the reaction will be :-
(i) X2 ⇌ X + X ( fast )
(ii) X + Y2 → XY + Y ( slow )
(iii) X + Y → XY ( fast )
Overall rate = Rate of slowest step (ii) = k[X][Y2] ...(1)
k = rate constant of step (ii)
(i) is reversible then its equilibrium constant
Rate = 
overall order = 1/2 +1 = 1.5
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