Topic 4

Question 1

What is halogenation?

Answer 1

Add’n of hallogens across a double bond

• Stereospecific
• -Anti-addition:
  
  • Produces trans product

Question 2

Halogenation of 1,2-dimethylcyclopentene requires _______

and produces trans-1,2-Dibromo-1,2-dimethylcyclopentane

Answer 2

Halogenation of 1,2-dimethylcyclopentene requires Br₂

and produces ___________

Question 3

What is the mechanism of the halogenation of 1,2-dimethylcyclopentene?

Answer 3

Question 4

The halogenation of 2-Methylpropene requires _____ and produces 2-chloro-1-iodo-2-methylpropane

Answer 4

The halogenation of 2-Methylpropene requires I-Cl and produces _________

Question 5

What is Markovnikov’s rule?

Answer 5

In an addition reaction, the positive end of an A-B system (eg Cl-I) adds to the least substituted end of the double bond to make the more stable carbo-cation