Question

What will be the product of reaction?

A.
B.
C.
D.

Answer 1

We have to know that the p-cresol is also known as 4-methyl phenol. It is an organic compound having the formula, $C{H_3}{C_6}{H_4}$. The p-cresol does not have any colour and it is mainly used as an intermediate while preparing the other chemicals. The p-cresol is a derivative of phenol and it is an isomer of m-cresol and o-cresol. In the case p-cresol, the methyl group is attached on the para position, and a hydroxyl group is directly attached with the phenol ring.

Complete answer:
When an aromatic ring is reacted with benzene diazonium chloride, there is a formation of azo compounds. Here, p-cresol is reacted with benzene diazonium chloride, at the pH range$8 - 10$, there will obtain the azo compound, and that is, $4 -$methyl $- 2 -$(phenyldiazenyl) phenol. The benzene diazonium chloride contains the diazonium ions and that is, $- N_2^ +$group. And this group is attached to the benzene ring. When p-cresol is reacted with benzene diazonium chloride the diazo group will attach to the p-cresol. Let’s see the reaction,

Hence, option (A) is correct.
When p-cresol is reacted with benzene diazonium chloride, there will not be $4 -$methyl$- 3 - ($phenyldiazenyl) phenol. Hence, option (B) is incorrect.
When p-cresol is reacted with benzene diazonium chloride, there will not be $5 -$methyl-[$1,1' -$biphenyl]$- 2 -$ ol. Hence, option (C) is incorrect.
$1 -$Phenyl$- 2 -$ (p-tolyloxy) diazene is not formed as a product. Hence, option (D) is incorrect.

Hence, option (A) is correct.

Note:
We need to know that when an aromatic compound is reacted with benzene diazonium chloride, there is a formation of azo compound. The azo compound containing the functional group diazenyl, R - N = N - {R^'}. Here, R and R’ may be alkyl or aryl. And the $N = N$group is known as azo group. And this aromatic azo compound is formed by the reaction of organic substances with diazonium salt.