It is a two step reaction in which 1. di-alkyl benzene is oxidised 2. In step two , the acidic environment helps in providing the Hydronium ions and they easily get converted into a carboxylic acid . Phtahlic Acid is used in various kind of preparations and has a vast industrial applications.
It is the reaction between alkyl halides and sodium in the dry ether to give alkanes with higher number of carbon. 2R-X + 2 Na —> R-R +2NaX
Chlorobenzene and bromobenzene can be prepared by treating bezenediazonium chloride with cuprous chloride or cuprous bromide. This reaction is also called Sandmeyer’s reaction.