Ethyl bromide is heated with $\mathrm{AgNO}{}_2$ in ethanol. The major organic product is

$\mathrm{AgNO}{}_2$ is covalent, so the lone pair on nitrogen attacks the carbon, giving the nitroalkane (attack through N). Ionic nitrites such as $\mathrm{KNO}{}_2$ would favour the alkyl nitrite instead. The product is nitroethane.