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The reaction of cis-1-bromo-2-methylcyclohexane with EtONa in EtOH proceeds via an E2 elimination mechanism, resulting in the formation of 2-methylcyclohexene. The reaction proceeds through the formation of a transition state in which the C-Br and C-H bonds break simultaneously, leading to the formation of a double bond between the C1 and C2 atoms and the elimination of EtBr. The reaction is stereospecific, resulting in the formation of the E-isomer of the alkene as the major product.