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

In the reaction, R – Br + Cl rarr R-Cl + Br^(-) . The rates of SN_2 reaction of ethyl bromide (I), n-propyl bromide (II), isobutyl bromide (III) and neopentyl bromide (IV) follow the order:

In the reaction : R-Br+CI^(-) to R -CI+Br^(-) The rates of reaction of ethyl bromide (I) n-propyl bromide (II) isobutyl bromide (III) and neopentyl bromide (IV) follow the order:

For the reaction R- Br to R- O - N =O the suitable reagent is

For the reaction R- Br to R- O - N =O the suitable reagent is