Mechanism of a hypothetical reaction
X2+Y2 GIVES 2XY
(i)X2 GIVES X+X (FAST)
(ii) X+Y2 REV REACTION GIVES XY+Y (SLOW)
(iii)X+Y GIVES XY (FAST)
The overall order of the reaction is
(a) 0 (b)1.5 (c)1 (d) 2
Option (b) is correct. Please try to solve if yourself if not done already. Please revise from #12 | Problems on 1st Order Reaction (Type 5) video as Vipin sir has solved very similar problem in that.