Final answer:
The student's question asks for the major product of a reaction with CH₃CH₂Br, which could result from substitution or elimination mechanisms leading to haloalkanes or alkenes, depending on the conditions and reagents involved.
Step-by-step explanation:
The question pertains to the prediction of major products formed during chemical reactions involving haloalkanes, specifically with the compound CH₃CH₂Br. In such reactions, we often observe substitution or elimination processes. When CH₃CH₂Br is treated with a nucleophile or a base, for instance, it can undergo an SN1 or SN2 mechanism, depending on the conditions and nature of the reagent involved. If it's an SN2 mechanism, the product will be a direct substitution where the Br is replaced with the incoming nucleophile. In the case of elimination, the product would be an alkene.
It's also worth noting that in certain conditions, excess halogen may lead to a chain of halogenation reactions, forming polyhalogenated products. Control of reaction conditions is crucial to ensure the desired product is obtained with minimal side products. These haloalkanes can then participate further in polar reactions, which can be discussed in more complex scenarios of organic synthesis.