Alkane Reactivity Puzzle?

📌 CONCEPT: The reactivity of alkane molecules, such as 1-methylcyclopentane, is influenced by the presence of free radicals, heat, and sunlight, leading to different reaction rates and products.

📐 RULE / FORMULA: The rate of alkane reactions is generally increased by the presence of free radicals and heat, while sunlight can initiate photochemical reactions.

💡 WORKED EXAMPLE: If one of the 1-methylcyclopentane molecules is heated in the presence of sunlight, it may undergo a photochemical reaction, resulting in the formation of a new compound. In contrast, the molecule with a free radical initiator will undergo a thermal reaction, leading to a different product. The third molecule, without any external energy source, will likely remain unreacted.

⚠️ COMMON MISTAKE: Students often overlook the role of free radicals and photochemical reactions in alkane reactivity, mistakenly assuming that all alkane reactions proceed at the same rate and yield the same products.