trans isomers of alkenes has higher melting points why
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The "U" shape of the cis isomer doesn't pack as well as the straighter shape of the trans isomer. The poorer packing in the cis isomersmeans that the intermolecular forces aren't as effective as they should be and so less energy is needed to melt the molecule - a lower melting point.
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the trans isomer has high mp because of symmetrical structure and more compact packing in space
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