[Krio]

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.

[mikasaur]

Hello and welcome to the forum!

I know your mind is fried, but before we can help you must show your attempts at solving the problem. It's part of the forum rules you can read here.

[AWK]

Just draw structures by trial and error method.

[Krio]

I think I've figured it out, I've submitted my answers so I can't post my work but I will once I get it back