Chlorobenzene (c6h5cl) is used as a solvent and also as an intermediate to produce many chemicals in industry. this compound is produced by bubbling chlorine gas through liquid benzene. an undesirable side reaction takes place between the chlorobenzene with chlorine to give dichlorobenzene (c6h4cl2). a third reaction also takes place where the dichlorobenzene is converted to trichlorobenzene (c6h3cl3). the feed to the reactor is benzene and commercial chlorine gas (98 wt% chlorine and the rest impurities). the liquid output from the reactor is a mixture that contains 65 wt% benzene, 32 wt% c6h5cl, 2.5 wt% c6h4cl2 and 0.5 wt% c6h3cl3. the other stream leaving contains the gases hcl and impurities. taking a basis of 100 mol benzene products leaving the reactor. a) calculate the percentage excess of benzene fed to the reactor b) the fractional conversion of benzene c) the fractional yield of chlorobenzene. d) why wasn’t pure chlorine used instead of commercial?