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- Rank these conformations from least to most stable.Which cyclization should occur with a decrease in energy? Why?a. Which is the most stable: 3,4-dimethyl-2-hexene, 2,3-dimethyl-2-hexene, or 4,5-dimethyl-2-hexene? b. Which compound has the largest heat of hydrogenation? c. Which compound has the smallest heat of hydrogenation?