Question Detail
Question
Which hydrocarbon molecule with eight carbons would produce the lowest octane number (i.e., the most knocking) when used as a fuel in automobile?
Correct Answer
Option B is the correct answer.
Detailed Explanation
n-Octane (straight-chain alkane) has the lowest octane number among C8 isomers because straight-chain alkanes knock the most. Branched alkanes have higher octane numbers.
Hint
Which type of alkane has the lowest octane number?