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Cyclopropane isomerizes exothermically to propene as shown. The C–C single bond in propene has an esThermodynamics Chemistry Question

Question

Cyclopropane isomerizes exothermically to propene as shown.

The C–C single bond in propene has an estimated bond dissociation enthalpy (BDE) of 345 kJ mol-1, while the C=C double bond in propene has a BDE of 611 kJ mol-1. Assuming that the C–H bonds in propene and cyclopropane all have the same BDE, what is the estimated BDE of a C–C single bond in cyclopropane?

A.

308 kJ mol-1

✓ Correct
B.

329 kJ mol-1

C.

423 kJ mol-1

D.

924 kJ mol-1

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