CAIE A Level Chemistry 9701 · An introduction to organic chemistry
Cyclohexane, , is a cyclic alkane. Describe the shape and bond angles of the carbon skeleton in cyclohexane, and explain why the carbon atoms in cyclohexane are not all in the same plane. In contrast, describe the arrangement of atoms in ethene, , and explain why the bond angles in ethene differ from those in cyclohexane.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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