Question

The colour of dye formed in the reaction between benzene diazonium chloride and phenol is:
a.) Yellow
b.) Orange
c.) Purple
d.) Blue

Answer 1

In order to solve the given problem and find the colour of the dye formed in the reaction between benzene diazonium chloride and phenol. We will first see the chemical structure of the compounds benzene diazonium chloride and phenol. Further we will also see the chemical reaction between benzene diazonium chloride and phenol and the product formed. On the basis of the product formed in the reaction we will predict the colour of the dye out of the given four options.

Complete step by step answer:
There is a reaction between benzene diazonium chloride and phenol.
We have to find the colour of the dye formed.
First let us see the compounds one by one.
The chemical structure of benzene diazonium chloride is:

The chemical structure of phenol is:

Now let us see the reaction between benzene diazonium chloride and phenol and the product formed in this process:

From the above reaction we can see that the reaction between benzene diazonium chloride and phenol produces p-hydroxyazobenzene. And the colour of this dye is orange.
Hence, the colour of dye formed in the reaction between benzene diazonium chloride and phenol is orange.
So, the correct answer is “Option B”.

Additional Information:
With the molecular formula ${C_6}{H_5}OH$ , Phenol is an aromatic organic compound. It is a crystalline white solid that is volatile. It is mildly acidic, so it can cause chemical burns, it needs cautious handling. Phenol is particularly used in the manufacturing of phenolic resins and in the processing of nylon and other synthetic fibres. It is also used as a disinfectant and antiseptic in slimicides (chemicals that destroy slime bacteria and fungi), and in medical preparations such as mouthwash and sore throat lozenges.

Note: In order to solve such types of problems students must remember the chemical structure of some common types of organic compounds such as phenol and also students must remember the reactions between the compounds and the colour of the dye.