unknown compound X is spotted on a TLC plate that is then developed in hexane. The solvent front is measured at 4.5 cm and the distance traveled by compound X is measured at 1.5 cm. A sample of caffeine is spotteed on the TLC plate that is then developedi n a 1:1 hexane/ethyl acetate solution the solvent front is measured at 6.5 cm and the distance traveled by caffeine is measured at 2.15 cm. What can be determined about the identity of compound X in light of this data.