Which of the following reactions is not possible?

R - O H + N a B r \to R - B r + N a O H

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R - O H + H B r \to R - B r + H_{2} O

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Both reactions are possible

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Both reactions are not possible

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Solution

The correct option is C $R - O H + N a B r \to R - B r + N a O H$
$O H^{-}$ is not a good leaving group so attach of $B r^{-}$ do not take place easily. This reaction is possible in the presence of acids like $H C l, H_{2} S O_{4}$ .

$O H^{-}$ is not a good leaving group as it is a strong base. If you add $H^{+}$

$R - O H + H^{+} \to R - O H_{2}^{+}$

Now $H_{2} O$ is a good leaving group so now it can be replaced by $B r^{-}$ .
Hence option A is correct.

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The reaction R - Br + NaCN → R-CN + NaBr, is an example of

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