1: H2SO4 / H2O / 2 h / Heating 2: 1.) NaNO2, HCl, 2.) Na2CO3 / 1.) water, 0 deg C, 30 min, 2.) water, 5 deg C, 2 h View Scheme

hydrogenchloride; sodium carbonate; sodium nitrite 1.) water, 0 deg C, 30 min, 2.) water, 5 deg C, 2 h; Yield given. Multistep reaction;