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Question

When Aniline is treated with Nitrous acid, which is prepared in situ from Sodium Nitrite and mineral acid, the product formed is:
C6H5NH2+HCl+NaNO2 _____________ + 2H2O

A
Chloro benzene
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B
Benzene diazonium chloride
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C
both A and B
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D
None
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Solution

The correct option is B Benzene diazonium chloride
Aniline on reaction with nitrous acid gives Benzene diazonium chloride. This is a very important precursor to manufacturing dyes and other essential compounds. Of course, in the following we haven’t shown the water molecule which was given as part of the question:

As mentioned in the question, HNO2 is prepared in situ from Sodium Nitrite and Hydrochloric acid (any good mineral acid). In the above reaction, the product is called Benzene diazonium chloride

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