After a sample of (
R)-2-chlorobutane

reacted with Br
2 in the presence of light, all the products with molecular formula C
4H
8BrCl were isolated. Two possible products are shown below:

Of these:
◦ Only II was formed.
◦ Only I was formed.
◦ Both I and II were formed in equal amounts.
◦ Both I and II were formed in unequal amounts.
◦ Neither I nor II was formed.