Answer
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Hint:You can figure out what the compounds are by looking at all the reactions and figure out a starting material that can undergo all the following reactions. You can start the solution by describing stepwise reactions with properly labelled diagrams. Then follow by summarizing all the reactions in one diagram.
Complete step-by-step answer:
The reactions occur in the following steps –
Step 1 – Aniline reacts with \[NaN{O_2}\] and \[HCl\] at \[273 - 278K\] to form Benzene diazonium chloride. Aniline is a primary aromatic amine. Aniline is a compound which has an amino (\[N{H_2}\]) group attached to a benzene ring. The reaction is shown below
Aniline is the compound \[[A]\] and Benzene Diazonium Chloride is the compound \[\left[ B \right]\].
Step 2 - Benzene Diazonium Chloride reacts with \[HB{F_4}\] in the presence of heat forms fluorobenzene. Fluorobenzene on further heating with \[NaN{O_2}\] forms Nitrobenzene as the product. This reaction is shown below
Nitrobenzene is the compound \[[C]\] mentioned in the problem.
Step 3 – Nitrobenzene is reduced in the presence of \[Sn/HCl\] to form Aniline.
This reaction is shown below
The whole reaction is summarized in the following diagram
Hence, Aniline is the compound \[[A]\],Benzene Diazonium Chloride is the compound \[\left[ B \right]\] and Nitrobenzene is the compound \[[C]\] mentioned in the problem.
Note: The reaction used in step 1 is used in making dyes and pigments. The reaction in step 2 is used to make fluorobenzene which is very important in controlling the carbon content in steel manufacturing. The second reaction in step 2 is used to produce nitrobenzene which is heavily used in lubricating oils in motors and machinery.
Complete step-by-step answer:
The reactions occur in the following steps –
Step 1 – Aniline reacts with \[NaN{O_2}\] and \[HCl\] at \[273 - 278K\] to form Benzene diazonium chloride. Aniline is a primary aromatic amine. Aniline is a compound which has an amino (\[N{H_2}\]) group attached to a benzene ring. The reaction is shown below
Aniline is the compound \[[A]\] and Benzene Diazonium Chloride is the compound \[\left[ B \right]\].
Step 2 - Benzene Diazonium Chloride reacts with \[HB{F_4}\] in the presence of heat forms fluorobenzene. Fluorobenzene on further heating with \[NaN{O_2}\] forms Nitrobenzene as the product. This reaction is shown below
Nitrobenzene is the compound \[[C]\] mentioned in the problem.
Step 3 – Nitrobenzene is reduced in the presence of \[Sn/HCl\] to form Aniline.
This reaction is shown below
The whole reaction is summarized in the following diagram
Hence, Aniline is the compound \[[A]\],Benzene Diazonium Chloride is the compound \[\left[ B \right]\] and Nitrobenzene is the compound \[[C]\] mentioned in the problem.
Note: The reaction used in step 1 is used in making dyes and pigments. The reaction in step 2 is used to make fluorobenzene which is very important in controlling the carbon content in steel manufacturing. The second reaction in step 2 is used to produce nitrobenzene which is heavily used in lubricating oils in motors and machinery.
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