CHEM 237 - Organic Chemistry Lab Final Exam TAMU 100% Solved

Separation by liquid-liquid extraction is based on a) compound's dielectric constant in 2 dif solvents b) # of theoretical plates in the separation c) use of phase transfer catalysts d) difference in boiling points of 2 liquids e) distribution of a compound between 2 immiscible phases - e) Distribution of a compound between two immiscible phases. Preparative gas chromatography is often chosen over distillation as a means of separation because gas chromatography a) is relatively inexpensive b) does not require thermally stable compounds c) can separate some compounds with identical boiling points d) will allow large quantities of sample to be injected e) does not require that compounds be volatile to be separated - c) Can separate some compounds with identical boiling points In the Phase Transfer Catalysis experiment (10), a general form of quaternary ammonium salt is R4N+X. The R4N+, where R is an alkyl chain, can be in both the aqueous (polar) and organic (nonpolar) phase because [choose as many as apply] I) R4N+ is a charged species that can dissolve in the aqueous pase II) R4N+ is a charged species that can dissolve in the organic phase III) R is a hydrocarbon chain that can dissolve in the aqueous phase IV) R is a hydrocarbon chain that can dissolve in the organic phase - I) R4N+ is a charged species (polar) and charged species can dissolve in the aqueous phase.