WAEC Chemistry 2020 Objective — Question 18
Question 18 of 50 from the West African Examinations Council (WAEC) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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The boiling point of pentane is higher than that of propane because A. carbon-carbon single bonds are stronger B. pentane has more covalent bonds to break C. pentane does not burn easily as propane D. the intermolecular forces in pentane are stronger than those of propane.
- A. carbon-carbon single bonds are stronger
- B. pentane has more covalent bonds to break
- C. pentane does not burn easily as propane
- D. the intermolecular forces in pentane are stronger than those of propaneCorrect
Explanation
Since both propane and pentane are non-polar, the intermolecular forces in them are Van der Waal's forces. However, the Van der Waal's forces in pentane are stronger because pentane is heavier; the strength of Van der Waal's forces increases with size of molecule.
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