Identify which of the following statements about the halogenation of alkane hydrocarbons are correct.
a) Halogenation of alkanes follows a chain mechanism.
b) The initiation process involves the formation of a halogen molecule.
c) Heat or UV light causes the weak halogen bond to break.
d) A radical is an intermediate with a single unpaired electron.
e) Halogenation of alkanes is a rearrangement reaction.