c. E-1-methylcyclooctene The vicinal arrangement of the methyl groups in the 1,2 dimethylcyclohexene is the more stable as the resonance stabilization of the tetrasubsituted alkene far exceeds that in the other possible stuctures Solution c. E-1-methylcyclooctene The vicinal arrangement of the methyl groups in the 1,2 dimethylcyclohexene is the more stable as the resonance stabilization of the tetrasubsituted alkene far exceeds that in the other possible stuctures.