2021 P1 Q5 - Comparing Bond Energy and Bond Length for Hydrocarbons

Let's take a look at 2021 A Levels H2 Chemistry Paper 1 Question 5.

We want to compare bond energy and bond length of carbon-carbon bond for C₂H₆, C₂H₄ and C₂H₂.

Let's take a look at the comparison.

In ethane (C₂H₆) there is a carbon-carbon single bond which is the weakest, hence lowest bond energy and longest bond length.

In ethyne (C₂H₂) there is a carbon-carbon triple bond which is the strongest, hence highest bond energy and shortest bond length.

Therefore from C₂H₆ to C₂H₂, we expect bond energy to increase and bond length to decrease (option C).

Topic: Chemical Bonding, Physical Chemistry, A Level Chemistry, Singapore

Back to list of questions for 2021 A Level H2 Chemistry Paper 1.

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