A high octane rating in gasoline causes less engine 'knock' because
A) high octane gas is easier to distill than low octane.
B) high octane is less complex hydrocarbons than low octane.
C) high octane can withstand high compression in a cylinder without igniting.
D) the isomer n-heptane is the primary component.
E) high octane contains small amounts of isooctane.
Correct Answer:
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