How does the number of products in a synthesis reaction compare with the number of reactants? A. The number of products is the same as the number of reactants. B. The number of products is less than the number of reactants. C. The number of products is greater than the number of reactants. D. The number of products may be greater than or less than the number of reactants.

In a synthesis reaction, two or more reactants combine to form a single product. Therefore, the number of products is typically less than the number of reactants. For example, in a simple synthesis reaction like: \[ A + B \rightarrow AB \] Here, there are two reactants (A and B) and one product (AB). However, it's important to note that in some cases, multiple products can be formed from a single reactant or multiple reactants can lead to multiple products, but in the context of a straightforward synthesis reaction, the general rule is that the number of products is less than the number of reactants. Thus, the correct answer is: **B. The number of products is less than the number of reactants.**