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The magnetic circular dichroism (MCD) spectra of the $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}E1u\leftarrow 1A1g$ transition of benzene and its methyl derivatives have been measured in the gas-phase and in solution. From these data, the magnetic moments of the $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}E1u$ state in these compounds are obtained. The magnetic moments in solution decrease with increase in methyl substitution. In the gas-phase, Rydberg transitions contribute to the MCD and in some cases prevent the determination of the magnetic moment.