Discussion
Which stationary phase suits non-polar analytes?
Answer: D
Polydimethylsiloxane is essentially non-polar and separates non-polar compounds largely in order of boiling point, which is why it is the default first choice. Polyethylene glycol and cyanopropyl phases are polar and retain polar compounds selectively. Matching the phase's polarity to the analytes' is the principle, and like dissolves like remains the most useful guide in choosing one. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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