Which Is NOT True for Solute Retention

Multiple Choice

Which is NOT true for solute retention?

A) Retention time,t_r,is the elapsed time between injecting the sample to the arrival of a sample component at the detector minus the dwell time between the end of the column and the detector.
B) Adjusted retention time is t_r^' = t_r - t_m,where t_r is the retention time and t_m is the time for mobile phase or unretained solutes to pass through the column.
C) The relative retention, =

,is the ratio for the adjusted retention time for two components of the sample,where t_r2^' > t_r1^' so that  > 1.
D) The retention factor,k =

,is the time,t_r,required to elute a component minus the time,t_m,for mobile phase to pass through the column divided by t_m.
E) The relative retention,,also equals

,where K₂ and K₁ are the partition coefficients for components 2 and 1.