Assertion : ${B r}_{2}$ is oxidised to $B r O_{3}^{-}$ in basic medium. Reason: When ${B r}_{2}$ is passed into hot $N a O H$ , it disproportionates to ${B r}^{-}$ and $B r O_{3}^{-}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
When $B r_{2}$ is passed into hot $N a O H$ , it disproportionates to $B r^{-}$ and $B r O_{3}^{-}$ .
The oxidation number of bromine in $B r_{2}$ is $0$ .
The oxidation number of bromine in $B r O_{3}^{-}$ is $+ 5$ .
The oxidation number of bromine in $B r^{-}$ is $- 1$ .
Thus, in basic medium, $B r_{2}$ is oxidized to $B r O_{3}^{-}$ and at the same time, it is reduced to $B r^{-}$ .
Hence, assertion is incorrect but Reason is correct.

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Assertion :Br2 is oxidised to BrO−3 in basic medium. Reason: When Br2 is passed into hot NaOH, it disproportionates to Br− and BrO−3.

Assertion : ${B r}_{2}$ is oxidised to $B r O_{3}^{-}$ in basic medium. Reason: When ${B r}_{2}$ is passed into hot $N a O H$ , it disproportionates to ${B r}^{-}$ and $B r O_{3}^{-}$ .