Electrophilic Aromatic Substitution Reactions

This video tutorial covers electrophilic aromatic substitution reactions, focusing on Friedel-Crafts alkylation and nitration of benzene. It explores synthesis problems, limitations of Friedel-Crafts reactions, and advanced techniques for creating complex benzene derivatives. The tutorial emphasizes understanding directing effects, steric effects, and the importance of reaction order in achieving desired products.

What is the major product when benzene reacts with ethyl chloride in the presence of aluminum chloride?

• Chlorobenzene

• Ethylbenzene

• Phenol

• Benzaldehyde

In a reaction involving nitrobenzene and bromine with FeBr3, where does the bromine atom preferentially add?

• Meta position

• Ortho position

• Para position

• No reaction occurs

When a hydroxyl group and a methyl group are para to each other on a benzene ring, which group directs the incoming electrophile more strongly?

• Neither, they cancel each other out

• Both equally

• Methyl group

• Hydroxyl group

Which of the following is a limitation of the Friedel-Crafts alkylation reaction?

• It is not affected by steric hindrance

• It proceeds with strongly deactivated rings

• It cannot form polyalkylated products

• Carbocation rearrangements can occur

What is a common issue when using Friedel-Crafts alkylation on a benzene ring with a nitro group?

• No reaction occurs due to deactivation

• The nitro group enhances the reaction

• The nitro group is replaced by the alkyl group

• The reaction proceeds smoothly

Which reagent is used to convert benzene into benzoic acid?

• Chromic acid with heat

• Aluminum chloride

• Nitric acid

• Sulfuric acid

What is the major product when propyl chloride is used in a Friedel-Crafts alkylation reaction with benzene?

• Isopropyl benzene

• Propyl benzene

• Benzaldehyde

• Toluene

Which reagent is used to replace a bromine atom with a methyl group on a benzene ring?

• Friedel-Crafts reagent

• Gilman reagent

• Grignard reagent

• Sulfuric acid

What is the first step in synthesizing para nitro benzoic acid from benzene?

• Sulfonation

• Reduction

• Friedel-Crafts alkylation

• Nitration

How can the yield of ortho-brominated tert-butyl benzene be increased?

• Adding a catalyst

• Using excess bromine

• Increasing the temperature

• Using a blocking group