Q. Which among the following is the objective of the Methyl tert-butyl ether (MTBE) mixing with Petroleum? 
Answer: Raise Octane Number
Notes:

MTBE is a gasoline additive, used as an oxygenate to raise the octane number. Its use is controversial in the US and declining in that country in part because of its occurrence in groundwater and legislation favoring ethanol.

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