Electrophilic Aromatic Substitution Concepts

This video tutorial covers the concepts of ortho, para, and meta directors in aromatic substitution reactions, focusing on electrophilic and nucleophilic aromatic substitution. It explains how to rank compounds by reactivity, lists essential reactions for tests, and provides synthesis and mechanism problem-solving examples. The video emphasizes the importance of understanding the role of electron-donating and electron-withdrawing groups in these reactions.

Which of the following groups is typically an ortho-para director in electrophilic aromatic substitution?

• COOH

• NH2

• NO2

• SO3H

In electrophilic aromatic substitution, what role does the benzene ring play?

• Nucleophile

• Electrophile

• Catalyst

• Leaving group

Which reaction involves replacing a hydrogen atom on a benzene ring with a nitro group?

• Bromination

• Nitration

• Chlorination

• Sulfonation

What is the main reason for using a protecting group in synthesis involving an amine group?

• To increase the reactivity of the amine

• To prevent the amine from reacting with strong acids

• To convert the amine into a more stable form

• To enhance the electrophilicity of the amine

Which of the following is a key step in the Friedel-Crafts acylation reaction?

• Formation of a carbocation

• Oxidation of the benzene ring

• Use of a Lewis acid catalyst

• Addition of a nitro group

What is the first step in converting benzene to benzoic acid?

• Oxidize with potassium magnate

• Use sodium hydroxide

• Add methyl chloride with a catalyst

• Add ethyl chloride with a catalyst

Which reagent is used to convert benzene into phenol?

• Potassium magnate

• Sodium hydroxide

• HNO3 with H2SO4

• Methyl chloride

In the synthesis of anol from benzene, what is the role of the Williamson's ether synthesis?

• To reduce a carboxylic acid

• To form an ether

• To form an ester

• To perform nitration

What is the key to forming 1,3,5-tribromo benzene from benzene?

• Use sodium amide

• Perform nitration three times

• Add bromine with FeBr3 three times

• Add methyl chloride

Which mechanism is involved in nucleophilic aromatic substitution when an electron-withdrawing group is present?

• Williamson's ether synthesis

• Addition-elimination mechanism

• Benzine intermediate

• Electrophilic aromatic substitution