Benzene Properties and Reactions

What is the name of the compound C6H5CH3?

• Benzaldehyde

• Phenol

• Methylbenzene

• Benzoic acid

What is the main difference between these two images of benzene models?

• Bond length differences

• Localised and delocalised electrons

• Electrophilic reaction mechanisms

• The molecular formula of benzene

Who proposed the cyclic structure with alternating double and single bonds for benzene?

• Avogadro

• Kekulé

• Dalton

• Curie

What is the molecular formula of benzene?

• C5H6

• C6H6

• C7H8

• C4H4

What did Kekulé's structures suggest about benzene's bond lengths?

• They are all equal

• They are unequal

• They are longer than in ethane

• They are shorter than in ethane

What type of system makes benzene more stable than the Kekulé model?

• Localized π-system

• Delocalized π-system

• Isolated π-system

• Concentrated π-system

Why do benzene reactions require catalysts?

• To increase the temperature

• To generate powerful electrophiles

• To stabilize the π-system

• To break σ-bonds

Why does benzene not undergo electrophilic addition easily?

• It would break up the stable delocalized system.

• It would form unstable π-bonds.

• It requires high energy.

• It forms weak σ-bonds.

What is the role of concentrated sulphuric acid in the nitration of benzene?

• It acts as a solvent.

• It generates the NO2+ electrophile.

• It neutralizes the reaction.

• It acts as a reducing agent.

Which of the following is NOT a product of the reaction between benzene and bromine with a catalyst?

• HBr

• Br+

• FeBr4-

• NO2+