Formation of which type of product--byproduct, side product, both, or neither--always coincides with a loss in percent yield of the desired product?

Side products coincides with a loss in percentage yield of the product

Explanation:

- The product yield is defined as

product yield = actual yield/theoretical yield

- Byproducts are undesired products that come from the same reaction pathway that our products → even if the reaction procedes ideally, we will always have byproducts → byproducts do not alter the Yield by themselves

- Side products, however, come from undesired products from side reactions and consume reactants due to these alternative pathways without producing our product → side products do alter the yield of the product