The following questions relate to meso-butane-2,3-diol. (Sections $18.2$ and $18.4$ )
(a) Draw sawhorse and Newman projections of the synperiplanar conformation of meso-butane-2,3-diol.
(b) Assign $R$ or $S$ configuration to each of the chiral centres in meso-butane-2,3-diol.
(c) Draw a Fischer projection of meso-butane-2,3-diol and use this to help to explain why this is a meso compound.
(d) Draw a Fischer projection of a diastereomer of mesobutane-2,3-diol.