Outline a complete mechanistic sequencefor the reaction of 2-bromobutane with potasium2-methyl-2-propoxide in 2-methyl-2-propanol solvent to form the three alkenes generated in the reaction (1-heptene, trans-2-heptane, and cis-2-heptene) Include a clear drawing of the anti-periplanar transition state for the formation of each alkene.