can someone please do this full question out

4. Answer ALL parts (a) 'BTEX' is a group of structurally-similar organic compounds including benzene, toluene, ethylbenzene and xylene isomers. These compounds are regulated toxic compounds and benzene is also a carcinogen. The data in the table below show the separation of a mixture of four of these 136 ), hs using gas chromatography (GC): toluene (b.p. 111C ), ethylbenzene (b.p. 136C), benzene (b,p,80C) and ortho-xvlene (h,n witions (i) Calculate the retention factor (k) for answer peak names for A,B,C and D. Justify the four analytes. Include in your brief outline of the separation process. Justify the elution order proposed with a (ii) What is the significance of measuring the theoretical plate (6) chromatography? Calculate the theoretical [8 marks] (H) for peak Dhy? Calculate the thuing the theoretical plate number in [ 6 marks] Show your calculatiotical plate number (N) and plate height (iii) An alternative method was used for the qu (4) BTEX in water satitative and extraction (SPME). Exps, This alternative quancilative the analys [6 marks] [6 marks]