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.

2021 p1 q5 question

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.

2021 p1 q5 compare bond energy and length

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).

2021 p1 q5 answer

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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