WAEC Chemistry 2019 Objective — Question 39

Question 39 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

Which of the following organic compounds has the lowest boiling point?

A. C6H14
B. C5H12
C. C4H10
D. (CH3)3CHCorrect

Explanation

C4H10 and (CH3)3CH (2-methylpropane) both have RMM 58, but the more highly branched (CH3)3CH has a lower boiling point than straight-chain C4H10, since branching reduces intermolecular contact/van der Waals forces.

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