Final answer:
When an oily layer forms on top of a reaction mixture after adding 3M H2SO4, it indicates that the reaction did not proceed as expected.
Step-by-step explanation:
When an oily layer forms on top of a reaction mixture after adding 3M H2SO4, it indicates that the reaction did not proceed as expected. When an oily layer forms on top of a reaction mixture after adding 3M H2SO4, it indicates that the reaction did not proceed as expected.
The presence of the oil suggests that the reactants did not mix properly or that there was an issue with the reaction conditions. It is important to troubleshoot the reaction and make sure that the reactants are properly mixed and the reaction conditions are appropriate for the intended reaction.