What is the formula of the product in this chemical reaction?
C3H5Br\text{C}_3\text{H}_5\text{Br}C3H5Br
C3H6Br2\text{C}_3\text{H}_6\text{Br}_2C3H6Br2
C3H7Br\text{C}_3\text{H}_7\text{Br}C3H7Br
C3H6Br\text{C}_3\text{H}_6\text{Br}C3H6Br