When comparing structural isomers with the same molecular mass, why does a linear molecule typically have a higher boiling point than a compact, spherical isomer?
Answer
The linear molecule has a greater surface area for intermolecular contact, enhancing LDFs.
For structural isomers where IMF type is constant (usually LDFs), molecular shape dictates boiling point via surface area. Linear molecules offer greater contact area than compact, spherical ones, leading to stronger cumulative LDFs and a higher boiling point.
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