Benzene Chemistry

What is true about C-C  bond lengths in benzene?

• alternative longer and shorter length
• All the same length 
• All different length
• two are the same length and the third one is different

What is the C-C Bond angle in benzene?

• 120⁰
• 120⁰ & 109.5⁰
• 109.5⁰
• 104.5⁰ & 120⁰

Which of these are  not evidence for the delocalised model?

• X-ray crystallography shows all bonds are same length
• Benzene is resistant to bromination
• Enthalpy of hydrogenation shows it is less than expected
• Enthalpy of hydrogenation shows it is  more than expected

Which mechanism an aromatic compounds react by?

• Electrophilic addition
• Electrophilic substitution
• Nucleophilic addition
• Nucleophilic substitution

How many delocalised electron are there for each benzene molecules?

• 2
• 3
• 6
• 12

Benzene is ......

• trigonal planar

• boat shaped

• planar

• chair shaped

Which of these best describes the bonding in 60 characters or less?

• the p-orbitals overlap to make a pi- bond
• the electrons are delocalised ring
• p-orbitals ovelap above and below plane and form 2 delocalised rings
• p-orbitals ovelap above and below plane and form a delocalised ring

Which of the following is a step in the general mechanism for the electrophilic aromatic substitution?

• A
• B
• C
• D

2. The reaction mechanism shown below is incomplete. What would be a correct addition to this mechanism?

• a curly arrow from Cl⁺ to the benzene ring

• a curly arrow from the displayed C–H bond, into the ring, in the intermediate

• an aromatic ring in the C₆ ring in the intermediate

• HCl  as a product in the final step

Which reagent can be used as a simple chemical test to distinguish between benzene and 1-hexene?

• A

• B

• C

• D

• E