4.2.2 Haloalkanes

Question 1

What does the curly arrow represent in mechanisms ?

Answer 1

Movement of electron pairs

Question 2

Outline the mechanism for the reaction between 1,1,-dichlororethane and bromine

Answer 2

1st curly arrow (from ANY alkene)
Curly arrow from double bond to Br of Br–Br

2nd curly arrow
Correct dipole on Br–Br
AND curly arrow for breaking of Br–Br bond

3rd curly arrow
Correct carbocation with + charge on C with 3 bonds
AND curly arrow from Br– to C+ of carbocation