JAMB Chemistry 2007 Objective — Question 47

Question 47 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2007 Objective paper, with the correct answer and a full explanation.

Which of the following compounds is the best possible anti-knock agent for petrol?

A. CH3CH2CH2CH2CH2CH3
B. CH3CH2(CH3)CHCH2CH2CH3
C. (CH3)3C-CH2CH2CH3
D. (CH3)2CH-CH(CH3)CH2CH3Correct

Explanation

The more highly branched a hydrocarbon chain, the better its anti-knock (octane) rating; among the options, the most branched structure is the best anti-knock agent.

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