Question

What will be the product of reaction?

A.

B.

C.

D.

Answer 1

Hint: 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.