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Which are the two main alcohols used in the engine as a fuel?

(a) Butanol and methanol

(b) Propanol and butanol

(c) Ethanol and propanol

(d) Methanol and Ethanol

I have been asked this question in a national level competition.

Question is taken from Alternative Fuels in section Fuels, Intake System & Leakage Preventers of Automotive Engine Design

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Correct answer is (d) Methanol and Ethanol

The explanation: Alcohols have been used as engine fuels for a long time, methanol and ethanol are the two main alcohols used in the engine as a fuel.

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