The result of a TLC experiment showed that a compound has an Rf value of 0.25 on a silica gel plate using 10% ethyl acetate in hexane as the mobile phase. Indicate if the Rf values of the compound would be higher or lower in each of the following solvents. Breifly explain your reasoning for full credit: (a) 100% hexane (b) 100% Toluene (c) 50:50 of hexane ethyl acetate (d ) 95:5 of ethyl acetate: methanol