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# For the reaction : $R - Br \rightarrow R - O - N=O$ the suitable reagent is

$\begin {array} {1 1} (A)\;NaNO_2 + HCl & \quad (B)\;HNO_2 \\ (C)\;AgNO_2 & \quad (D)\; KNO_2 \end {array}$

$R–Br\rightarrow R–O –N=O + KBr$