Machanism of a hypothetical reaction $X_2 + Y_2 \to 2XY$ is given below. <br> (i) $X_2 \to X + X (fast)$<br> (ii) $X + Y_2 \rightleftharpoons XY + Y (slow)$ <br> (iii) $X + Y \to XY (fast) $ <br> The overall order of the reaction will be -

Question

( A ) 0
( B ) 2
( C ) 1
( D ) 1.5