Which product is collected at the top of the fractional column during the fractional distillation of crude oil?

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Multiple Choice

Which product is collected at the top of the fractional column during the fractional distillation of crude oil?

Explanation:
Fractional distillation separates crude oil by boiling point, with a temperature gradient in the column: very hot at the bottom and cooler toward the top. Vapors rise and only condense when they reach a region cold enough for their boiling point. The lightest fractions have the lowest boiling points, so they condense and are collected near the top (sometimes remaining as gases). Refinery gases are made up of these extremely light hydrocarbons, such as methane, ethane, propane, and butane, so they appear at the top of the column. Heavier fractions like gasoline, kerosene, and diesel condense lower down where it’s hotter.

Fractional distillation separates crude oil by boiling point, with a temperature gradient in the column: very hot at the bottom and cooler toward the top. Vapors rise and only condense when they reach a region cold enough for their boiling point. The lightest fractions have the lowest boiling points, so they condense and are collected near the top (sometimes remaining as gases). Refinery gases are made up of these extremely light hydrocarbons, such as methane, ethane, propane, and butane, so they appear at the top of the column. Heavier fractions like gasoline, kerosene, and diesel condense lower down where it’s hotter.

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