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Testing Your Organic Chemistry Knowledge to Reinforce ...

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<strong>Testing</strong> <strong>Your</strong> <strong>Organic</strong> <strong>Chemistry</strong> <strong>Knowledge</strong> <strong>to</strong> <strong>Reinforce</strong> Comprehension and<br />

Understanding using Web-based Multiple Choice Questions<br />

Andrew Boa and Jason Eames*<br />

Department of <strong>Chemistry</strong>, University of Hull<br />

a.n.boa@hull.ac.uk; j.eames@hull.ac.uk<br />

20. Heat of Combustion 4<br />

Which cycloalkane has the lowest heat of combustion per CH2 group?<br />

a. cyclopropane<br />

b. cyclobutane<br />

c. cyclopentane<br />

*d. cyclohexane<br />

e. cycloheptane<br />

Correct Answer Reply:<br />

Molecules with more energy due <strong>to</strong> ring strain will release more energy per CH2.<br />

Considering the C-C-C bond angles, and their deviation from the ideal tetrahedral value,<br />

it can be seen that cyclohexane has the lowest heat of combustion per CH2 as it has the<br />

ideal C-C-C angles of 109°.

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