recall the reactants and conditions by which alkenes can beproduced

Alkenes can be produced through a variety of methods, but one of the most common is through the dehydration of alcohols, which is a type of elimination reaction. Here are the steps:

1. Reactants: The primary reactant in this process is an alcohol, which is an organic compound with a -OH (hydroxyl) group. The specific type of alcohol used can vary, but common examples include ethanol and propanol.

2. Conditions: The alcohol is heated with a strong acid, such as sulfuric acid (H2SO4) or phosphoric acid (H3PO4). This acid acts as a catalyst for the reaction, meaning it speeds up the reaction without being consumed by it.

3. Reaction: The heat and acid cause a molecule of water (H2O) to be removed from the alcohol. This is why the process is called "dehydration". The removal of this water molecule results in the formation of an alkene.

4. Products: The primary product is the alkene, along with water. The specific alkene produced depends on the specific alcohol used. For example, dehydration of ethanol produces ethene, while dehydration of propanol produces propene.

Remember that this is a simplified explanation and the actual process can be more complex, especially with larger and more complex alcohols. Also, safety precautions should be taken when handling strong acids and heating reactants.