To determine in which processes entropy increases, we need to understand how entropy behaves in different scenarios.$\\$Entropy, denoted as $S,$ is a measure of the disorder or randomness in a system. Generally, entropy increases when:$\\$• A substance changes from a more ordered state to a less ordered state (e.g., solid to liquid, liquid to gas).$\\$• The number of gas molecules increases in a chemical reaction.$\\$Let's analyze each option:$\\$