Electrophilic Aromatic Substitution

What is electrophilic substitution?

• A substitution reaction in which an electrophile is substituted for the electrons in the benzene ring

• A substitution reaction in which the benzene ring is attacked by a lone pair of electrons from an electrophile

• A substitution reaction in which an electrophile is attacked by the electrons in the benzene ring

Which is least reactive in aromatic electrophilic substitution?

• Ethyl Benzene

• Anisole

• Acetophenone

• Chlorobenzene

Which gives a meta nitro compound as the main product upon nitration with a nitric acid-sulfuric acid mixture?

• Ethyl Benzene

• Anisole

• Acetophenone

• Chlorobenzene

With respect to the electrophilic aromatic substitution of benzene which of the following is not true?

• A non-aromatic intermediate is formed

• Benzene acts as an electrophile

• A proton is lost in the final step

• Resonance forms are important

When considering electrophilic aromatic substitution reactions electron withdrawing substituents (e.g. cyano) are described as...

• Ortho/para directing and activating

• Ortho/para directing and deactivating

• Meta directing and activating

• Meta directing and deactivating

What will be the attacking electrophile in the reaction of halogenation of Benzene?

• Halonium ion

• carbocation

• Benzene

• Halogen

Why does benzene undergo substitution reactions rather than addition reactions

• Benzene is a planar, aromatic compound

• All the carbon atoms in benzene is sp2 hybridised

• All the carbon-carbon bonds in benzene is strong

• Benzene has extra stability due to the delocalized π electrons

Aromatic compounds usually undergo which type of reaction

• Electrophilic substitution reaction

• Electrophilic addition reaction

• Nucleophilic substitution reaction

• Nucleophilic addition reaction