Electrophilic Addition Reaction

Question 1

Step 2?

Answer 1

Heterolytic (unequal) fission of Br2. The closer and gives up the bonding electrons to the other Br and sticks to the Carbon atom.

Question 2

Step 3?

Answer 2

You get a positively charged carbonation intermediate.

Question 3

Step 4?

Answer 3

The Br- bonds to the other carbon atom, forming 1,2 dibromoethane

Question 4

Mechanism for ethene and bromine: step 1?

Answer 4

1) The double bond repels the electrons in Br2 , polarising Br-Br