:$B{r}^{}$:$o.$ :$.B{r}^{}$

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$H$ @${?}^{}O.$

$o+{?}_0{}^H$

H

:$B{r}^{}$:$$

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$B{r}_2,HBr$

$||\{\begin{array}{cc}\text{:}[B{r}_2,& HBr]\\ H_{2}O\end{array}$

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$HH$

$.$: $O^H$

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$H_{2}O$

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$B{r}_2,HBr$