Here is the question:
You can identify an unknown compound by counting the number of isomeric products it forms in different reactions.
For example, in the chlorination of propane, four different isomeric products with the formula C3H6Cl2 were isolated and designated by the letters A,B,C and D.
Each was separated and reacted with more chlorine to give one or more trichloropropanes, C3H5Cl3.
A gave one trichloropropane, B gave two, C and D gave three trichloro compounds. One of the trichloro compounds from C was identical to the trichloro compound from A. Determine the structural formulas for A,B,C and D.