CAIE A Level Chemistry 9701 · An introduction to organic chemistry
A student draws the displayed formula of a molecule with the structure: a chain of two carbon atoms, each carbon carrying hydrogen atoms, and one carbon also bonded to an group.
(a) State the general formula of the class of compound to which this molecule belongs. (b) Compare the physical properties of this molecule with those of an alkane with the same number of carbon atoms. (c) Deduce the empirical formula of this molecule.
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.