$\begin{array}{1 1} \text{(a) The aim of the reaction is to attach a acid group (-COOH group) to an aromatic system.} \\ \text{(b)The aim of the reaction is to attach a alcohlic group (-OH group) to an aromatic system.} \\ \text{(c)The aim of the reaction is to attach a formyl group (-CHO group) to an aromatic system.} \\ \text{(d) The aim of the reaction is to attach a formyl group (-CHO group) to an aliphatic system.}\end{array} $
