(d) For the analyte shown, list the following stationary phases in order of increasing retention time in reverse phase HPLC. Explain your answer. • C18 • C6 CH3 C8 Phenyl C4 Amino

You are monitoring the reaction A --> B via periodic GC analysis. Initially, you only see one peak in your chromatogram; however, over time you find that a new peak is growing while the original peak is shrinking. What is happening?

See image below

Draw a GC chromatogram for a 50:50 and 25:75 mixtures of hexane (bp 68°C) and toluene (bp 111°C).

Retention times with a 1.10 m gas-liquid chromatographic column: air, 18.0 s; methyl acetate, 1.98 min.; methyl propionate, 2.24 min; methyl n-butyrate, 7.93 min.Base widths of the last three peaks: 0.19; 0.23 and 0.79 min, respectively. Calculate:a) the value of k for each compound,b) the alpha value for each pair of adjacent peaks,c) the theoretical number of plates and the plate height of each column;d) the resolution of every two adjacent compounds.