Q.

Which of the following compound readily goes under the process of knocking?

A. 2-ethly butane
B. n-heptane
C. benzene
D. toluene
Answer» B. n-heptane
Explanation: n-heptane is a straight chain hydrocarbon which knocks readily and hence its octane number is zero. presence of straight chain hydrocarbon in gasoline reduces its rate of combustion.
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