The best chromatographic technique to analyse a solution of benzene, toluene, and ethylbenzene in n-hexane
The choice of analytical technique is based on three simple factors: what is available, and how low concentration do you want to go, and how much time do you have? Do you have a gas chromatograph with flame ionization detector or a UV high performance liquid chromatograph or both? This type of mixture is readily amenable to both GC and reversed phase HPLC. The only problem is hexane in reversed phase HPLC, but if less than 1 uL is injected it should be fine.