Gas chromatography separates compounds depending on their . Benzene, m-xylene, and toluene have similar , therefore, the main basis for separation is . The more volatile a component the , hence the more time it spends in the , giving it a retention time. Therefore, components of a liquid mixture will elute in order of .

Answer and Explanation:

Gas chromatography separates compounds depending on their **polarity and volatility**. Benzene, m-xylene, and toluene have similar **polarities**, therefore, the main basis for separation is **volatility**. The more volatile a component the ** higher its vapor pressure**, hence the more time it spends in the **gaseous mobile phase**, giving it a **shorter** retention time. Therefore, components of a liquid mixture will elute in order of **increasing boiling points/decreasing volatilities/increasing polarities with the stationary phase**.

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