In the E2 reaction, the percentage of formation of 1- butene was 20.7%.
The E2 reaction is defined as the process that takes place in one-step, and the E1 reaction is defined as the two-step mechanism. The numbers are used to represent the kinetics of the reaction rather than the number of steps in the mechanism.
E2 is bimolecular (second-order) kinetics, whereas E1 is unimolecular (first-order) kinetics. The three key factors that affect E1 elimination reactions are the solvent type, the leaving group's shape, and the carbocation's stability.
Hence, the percentage of formation of 1- butene was 20.7% and the reason is explained above.
Learn more about E1 and E2 reactions from the link given below.
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