1. The problem statement, all variables and given/known data The product formed in the reaction of SOCl2 with white phosphorus is 1. PCl3 2. SO2Cl2 3. SCl2 4. POCl3 2. Relevant equations NA 3. The attempt at a solution I can google that but I want to know that how can we know it intuitively or by ourselves? It was asked in a test and in test, internet is not available. There must be a way or then why it is asked in exam because there are many reactions in World ( may be infinite) and to rote memorize each of it may not be fruitful as we have to look at our retention power?