Question

When ethanol is treated with benzene diazonium chloride is forms:
A) Arenes
B) Methane
C) Amines
D) Ethyl alcohol

Answer 1

Hint: We have to know that the ethanol is considered to be a weak reducing agent, thus in this reaction also it reduces benzene diazonium chloride and itself gets reduced. Ethyl alcohol is commonly called ethanol and arenes are aromatic hydrocarbons as they involve ring structures and delocalization is present in the ring.

Complete answer:
We have to know that when ethanol is treated with benzene diazonium chloride it forms benzene and acetaldehyde as major products and hydrochloric acid and nitrogen gas is released. The chemical reaction can be represented as:

Benzene diazonium chloride salt can be formed by treating aniline in presence of sodium nitrate and hydrochloric acid, when benzene diazonium chloride is further treated with ethanol that is a mild reducing agent so it removes benzene from the diazonium salt and itself getting reduced to an aldehyde also producing nitrogen gas and hydrochloric acid as different products. Nitrogen gas is usually evolved in reaction involving benzene diazonium chloride as it has two nitrogen present in the structure thus dinitrogen can be easily escaped from the reaction.
When we look at all the option given;
Option A) is correct as arenes are aromatic hydrocarbons and simplest arene is benzene and we have shown in the chemical reaction that benzene is formed thus this is a correct option. Other options are not right as none of them is formed during chemical reaction.

Note:
We have to remember that this type of reaction can also be termed as deamination reaction. This reaction is a good method for converting benzene diazonium chloride into benzene, there are also many methods available but this is most suitable for getting benzene.