Question: The energy difference between cis- and trans-but-2-ene is about 4 kJ mol; however, the trans isomer of 4,4-dimethylpent-2-ene is nearly 16 kJ mol more stable

The energy difference between cis- and trans-but-2-ene is about 4 kJ mol; however, the trans isomer of 4,4-dimethylpent-2-ene is nearly 16 kJ mol more stable than the cis isomer. Explain this large difference.

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