please answer the question

Cross-linked polystyrene is often used as a resin in ion chromatography. An Rgroup is introduced on the phenyl ring to modify the nature of the resin. For the Rgroups below state whether the resin would be either a cation exchange resin or an anion exchange resin. (2 Marks) a) SO3H+ b) NH3+OH 9. You need to analyze a mixture of low molecular weight polymers. The mixture contains polystyrene (MW 4000 amu), polyethylene glycol (MW 10,000 amu) and polylactic acid (MW 20,000 amu). Which component would elute first off a GPC? Which component would elute last? (2 Marks)