{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Reactions of Alkenes", "refinement": "This problem specifically deals with the addition reactions of alkenes, particularly the reaction of 1,3-butadiene with HBr in the presence of peroxides, which follows a radical mechanism.", "specific_scope": "The focus is on the regioselectivity of the addition reaction, where the product distribution is influenced by the presence of peroxides, leading to anti-Markovnikov addition.", "goal": "Identify the major product formed from the reaction of 2-methyl-1,3-butadiene with HBr in the presence of peroxides."}, "summary": "This problem involves understanding the reaction of alkenes, specifically 2-methyl-1,3-butadiene, with HBr in the presence of peroxides, which leads to a radical mechanism resulting in anti-Markovnikov addition. The goal is to determine the major product of this reaction, which is 1-bromo-3-methylbutane. This highlights the importance of regioselectivity in organic reactions and the influence of reaction conditions on product formation."}