3 Reaction of 2-methyl-1,3-butadiene with bromine yields a mixture of products: 3,4dibromo-2-methyl-1-butene (3 \%), 3,4-dibromo-3-methyl-1-butene (21 \%) and 1,4dibromo-2-methyl-2-butene (76\%). a) Identify all products as either 1,2 or 1,4 adducts. b) Propose mechanisms for the formation of all 3 products. c) Explain why 3,4-dibromo-3-methyl-1-butene (21\%) predominates over 3,4-dibromo-2methyl-1-butene (3\%)