ACS Laboratory Safety Practice Test 2026 – Comprehensive Exam Prep

All the substances listed have the potential to form dangerous explosive peroxides under certain conditions, which is why selecting them all as the correct answer is appropriate.

Cyclohexene, being an unsaturated hydrocarbon, is susceptible to oxidation reactions. During these reactions, it can form peroxides, especially when exposed to air, heat, or light over time.

Ethyl ether is particularly notorious for forming explosive peroxides. It can undergo auto-oxidation when stored for long periods due to exposure to atmospheric oxygen, leading to the accumulation of unstable peroxide compounds. This is why ethyl ether is often stored with an inhibitor to prevent peroxide formation.

Para-Dioxane, another cyclic ether, also has a risk of peroxide formation. Similar to ethyl ether, it is prone to oxidation and can form peroxides that are hazardous due to their potential for violent decomposition.

Understanding that all these compounds can develop explosive peroxides emphasizes the importance of proper storage, handling, and monitoring of chemical reagents in the laboratory setting to prevent accidents.