(a)[1]
State the molecular formula of noradrenaline.
(b)[1]
State whether noradrenaline shows stereoisomerism, then explain your reasoning.
(c(i))[1]
At $5\,^{\circ}\text{C}$, separate samples of noradrenaline and phenylamine are each reacted with $\text{HNO}_2(\text{aq})$. The reaction with phenylamine gives a stable diazonium ion, while the reaction with noradrenaline gives an unstable diazonium ion. Suggest why the diazonium ion formed from phenylamine is stable.
(c(ii))[2]
When one molecule of noradrenaline reacts with one molecule of $\text{HNO}_2$, the products are one molecule of water, one molecule of an unreactive gas, and one molecule of an organic compound containing only carbon, hydrogen and oxygen. Complete the chemical equation for this reaction.