WAEC Chemistry 2011 Objective — Question 39

Question 39 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

Which of the following compounds determines the octane rating of petrol?

A. A. 1,2,3-trimethylpentane
B. B. 2,3,5-trimethyloctane
C. C. 2,3,5-trimethylpentane
D. D. 2,2,4-trimethylpentaneCorrect

Explanation

2,2,4-trimethylpentane (isooctane) determines the octane number of a petrol sample. Octane number = (Mass of 2,2,4-trimethylpentane / Mass of mixture) x 100.

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