Mechanisms

Question 1

Evidence for reaction between ethene and bromine

Answer 1

1,2-dibromoethane
1-bromi-2-chloroethane
2-bromoethanol

Question 2

Evidence for free radical substitution

Answer 2

Takes place when exposed to UV light
Thousands of chloroethane molecules formed for every photon of light
Ethane is a product
Adding tetramethyl lead speeds up reaction
Adding oxygen slows down reaction