(a(i))[2]
Define the following chromatography terms: $R_f$ value; retention time.
(a(ii))[1]
All chromatography types use a stationary phase and a mobile phase. Fill in Table 6.1 with a description of each one.
(b)[1]
A mixture containing two substances A and B is analysed by thin-layer chromatography. The $R_f$ value of substance A is larger than that of substance B. Suggest why substance A has a larger $R_f$ value.
(c(i))[1]
The two isomeric compounds Y and Z are examined by proton ($^1\mathrm{H}$) NMR spectroscopy. Complete Table 6.2 to predict how many peaks will be seen in the proton ($^1\mathrm{H}$) NMR spectra of Y and Z.
(c(ii))[2]
State all the different splitting patterns seen in the proton ($^1\mathrm{H}$) NMR spectra for Y and Z.