Question

Trans-2-butene has higher melting point than cis isomer.give reason.

Answer 1

Trans-2-butene has higher melting point than cis isomer because mp depends on packing efficiency. Trans molecule have effective packing than cis-molecule as it is more symmetric. Cis molecule has less effective packing and replusion also exists between the bulky methyl groups which are on the same side, therefore less melting point.

Answer 2

Trans-2-butene has a higher melting point than the cis isomer due to the more effective and close packing of molecules.

Explanation:

• The structures of trans-2-butene and cis-2-butene suggest that trans-2-butene has a more symmetrical structure than cis isomer.
• Due to the symmetrical structure, more effective and close packing of molecules is possible in trans-2-butene.
• On the other hand, the structure is cis-2-butene is not symmetrical and molecules are not closely packed.
• More effective packing of molecules holds the molecules together and thus, the melting point of the compound will be higher.
• Therefore, trans-2-butene has a higher melting point than cis-2-butene.

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