Diazonium Reactions and Azo Compounds

This video tutorial covers electrophilic aromatic substitution reactions, focusing on nitration, reduction, diazotization, and the Sandmeyer reaction. It explains the mechanisms of these reactions, starting with the nitration of benzene to form nitrobenzene, followed by its reduction to aniline using iron and HCl. The video then describes the conversion of aniline to arene diazonium salt through diazotization. The Sandmeyer reaction is discussed, highlighting the replacement of the diazonium group with various substituents using copper salts. Finally, the video covers diazo coupling reactions, forming azo compounds.

What is the electrophile in the nitration of benzene?

• Nitronium ion

• Hydronium ion

• Chloride ion

• Sulfate ion

Which reagent is used to reduce nitrobenzene to aniline?

• Copper chloride

• Sulfuric acid

• Iron and hydrochloric acid

• Sodium nitrite

What is the product formed when aniline is treated with sodium nitrite and hydrochloric acid?

• Bromobenzene

• Arene diazonium salt

• Phenol

• Nitrobenzene

What is the purpose of using sodium nitrite in diazotization?

• To act as a solvent

• To oxidize the amine group

• To form nitrous acid

• To reduce the nitro group

In the Sandmeyer reaction, what role does copper play?

• Reducing agent

• Oxidizing agent

• Solvent

• Catalyst

Which substituent can replace the diazonium group in the Sandmeyer reaction?

• Hydroxyl group

• Cyanide group

• Methyl group

• Ethyl group

Which of the following is a characteristic of the Sandmeyer reaction?

• Involves radical intermediates

• Uses sulfuric acid

• Produces nitro compounds

• Occurs at high temperatures

What is the main feature of azo compounds formed in the coupling reaction?

• Ether linkage

• Amide linkage

• Azo linkage

• Single bond linkage

What is the role of chloride ion in the azo coupling reaction?

• Acts as an oxidizing agent

• Acts as a nucleophile

• Acts as a reducing agent

• Acts as a base

What is the final product when phenol reacts with an arene diazonium salt?

• Nitrobenzene

• Aniline

• Benzene

• Azo compound