CAIE A Level Chemistry 9701 · An introduction to organic chemistry
The displayed formula of an organic compound is given below.
(a) Describe the functional group present in this compound. (b) State the systematic name of this compound. (c) Deduce the molecular formula of this compound. (d) Describe how a displayed formula differs from a structural formula and from a skeletal formula.
7 marks, so the mark scheme is looking for about 7 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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