What happens to the boiling point of crude oil fractions as you go down the distillation column?

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Multiple Choice

What happens to the boiling point of crude oil fractions as you go down the distillation column?

Explanation:
In fractional distillation, components separate by their boiling points because heavier hydrocarbons with longer chains have higher boiling points. As you go down the column, you encounter progressively heavier fractions with larger molecules. These require more energy to vaporize, so their boiling points are higher. The column is cooler at the top and hotter at the bottom, so light fractions with low boiling points condense near the top while heavier fractions with higher boiling points condense lower down. That’s why the boiling point increases as you move down the column.

In fractional distillation, components separate by their boiling points because heavier hydrocarbons with longer chains have higher boiling points. As you go down the column, you encounter progressively heavier fractions with larger molecules. These require more energy to vaporize, so their boiling points are higher. The column is cooler at the top and hotter at the bottom, so light fractions with low boiling points condense near the top while heavier fractions with higher boiling points condense lower down. That’s why the boiling point increases as you move down the column.

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