Which of the following is desirable in diesel and kerosene but is undesirable in gasoline?

Paraffins

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Mercaptans

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Aromatics

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Naphthenic acid

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Solution

The correct option is C Aromatics
Aromatics are desirable in diesel and kerosene but is undesirable in gasoline. It is a mixture of paraffin (alkanes), cycloalkanes (naphthenes), and olefins (alkenes). Aromatics are a base component of gasoline derived from crude oil. Refiners manipulate these substances – mainly mixtures of chemicals like benzene, toluene, and xylene – to increase the octane rating, a measure of how well the fuel actually works.

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