Rank from highest to lowest melting point of the following molecules: ethane, 2-butane, trans-2-butane, and cis-2-butane.
please explain how you come to your answer.

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  1. I suspect you have made some typos here. Is there such a molecule as 2-butane? 2-butene, perhaps. And with the cis and trans isomers, the saturated butane has no cis and trans isomers, does it? Again, you may mean cis-2-butene and trans-2-butene.

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