The order of the reaction occurring by following mechanism should be

$(i)$ ${A_2} \to A + A$ (fast)

$(ii)$ $A + {B_2} \to AB + B$ (slow)

$(iii)$ $A + B \to $ (fast)

  • A

    $1\,\frac{1}{2}$

  • B

    $3\frac{1}{2}$

  • C

    $2$

  • D

    None of these

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