Which of the following expression is correct for the rate of...

Which of the following expression is correct for the rate of reaction given below ?

$5{Br}^{-} \left(aq\right) + {BrO}_{3}^{-} \left(aq\right) + 6H^{+} \left(aq\right) ⟶ 3{Br}_{2}\left(aq\right)$ + $3{H}_{2}O \left(l\right)$

Options

A $\dfrac{\Delta\left[{\text{ Br }}^{-}\right]}$ {Δt} = \dfrac{5}{6}\dfrac{\Delta $\left[H^{+}\right]}{Δt}$
B $\dfrac{\Delta\left[{\text{ Br }}^{-}\right]}$ {Δt} = \dfrac{6}{5}\dfrac{\Delta $\left[H^{+}\right]}{Δt}$
C $\dfrac{\Delta\left[{\text{ Br }}^{-}\right]}$ {Δt} = \dfrac{5\Delta $\left[H^{+}\right]}{Δt}$
D $\dfrac{\Delta\left[{\text{ Br }}^{-}\right]}$ {Δt} = \dfrac{6\Delta $\left[H^{+}\right]}{Δt}$

A. $\dfrac{\Delta\left[{\text{ Br }}^{-}\right]}$ {Δt} = \dfrac{5}{6}\dfrac{\Delta $\left[H^{+}\right]}{Δt}$

The given chemical reaction is

$5{Br}^{-}\left(aq\right) + {BrO}_{3}^{-} \left(aq\right) + 6H^{+} \left(aq\right) ⟶ 3{Br}_{2}\left(aq\right) + 3{H}_{2}O\left(l\right)$

Rate law expression for the given reaction can be written as

$- \dfrac{1}{5}\dfrac{\Delta\left[{Br}^{-}\right]}{Δt} = - \dfrac{\Delta\left[{BrO}_{3}^{-}\right]}{Δt}$

$- \dfrac{1}{6}\dfrac{\Delta\left[H^{+}\right]}{Δt} = + \dfrac{1}{3}\dfrac{\Delta\left[{Br}_{2}\right]}{Δt}$

$⇒ - \dfrac{\Delta\left[{Br}^{-}\right]}{Δt} = - \dfrac{5\Delta\left[{BrO}_{3}^{-}\right]}{Δt} = - \dfrac{5}{6}\dfrac{\Delta\left[H^{+}\right]}{Δt}$

$\dfrac{\Delta\left[{Br}^{-}\right]}{Δt} = \dfrac{5}{6}\dfrac{\Delta\left[H^{+}\right]}{Δt}$