X and Y bonded into a more complex molecule. ZY has decomposed into two smaller compounds. X is a more reactive compound than Y. Y has changed into a new compound.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The formula X + ZY -> XZ + Y shows that
Possibilities:
- X and Y bonded into a more complex molecule.
- ZY has decomposed into two smaller compounds.
- X is a more reactive compound than Y.
- Y has changed into a new compound.

X is a more reactive compound than Y.