A solution contains 1g mol. Each of p-toluene diazonium chloride and p-nitrophenyl diazonium cholride. To this 1g mol.of alkaline solution of phenol is added. Predict the major product. Explain your answer.

Explanation

The above stated reaction is an example of electrophilic aromatic subsitiution . In alkaline medium, phenol generates phenoxide ion which is more electron rich than phenol and more reactive for electrophilic attack.
The electrophilic in this reaction is aryldiaronium cation. As we konw, stronger the electrphilie, faster is the reaction. p-nitrophenyldiazonium cation is a stronger electrophile than p-tolune diaznium cation.
So, nitrophenyl diazonium chloride couples preferntailly with phenol.