When physically comparing the melting points of standard cis and trans geometrical isomers, which co — Isomerism and Stereochemistry Chemistry Question
Question
When physically comparing the melting points of standard cis and trans geometrical isomers, which configuration generally exhibits the higher melting point, and what is the dominant structural reason?
Answer: B
💡 Solution & Explanation
Melting point largely depends on packing efficiency within a solid crystalline lattice structure. Trans isomers have terminal groups on opposite sides, making them highly linear and structurally symmetrical. This high symmetry allows the molecules to pack together very efficiently with significantly fewer voids compared to the bulky, 'U-shaped' cis isomers, leading to higher melting points.
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