For testing of aluminum chloride to explain why the reaction of benzene appears Ornge / red while naphthalene is blue

The reaction occurs as follows: CHCl3 + CHCl2 —–> AlCl3 + + + AlCl4-CHCl2 —–> ArCHCl2 ArH + + H + ArCHCl2 —–> AlCl3 + + + ArCHCl-AlCl4 ArCHCl ArH + + H + —–> Ar2CHCl + Ar2CHCl —–> AlCl3 + + + Ar2CH-AlCl4 Ar2CH ——> ArH + + H + + Ar3CH three Friedel-Crafts alkylation to produce Methane trisubstituted, Ar3CH finally a carbocation produced earlier in response to these attacks Ar3CH: R —–> Ar3CH + + + + HR Ar3C This reaction is favorable because the carbocation on the right side is the conjugate, and therefore more stable. But as I mentioned, it is highly conjugated. This means that energy levels are closely spaced. As there is a vacancy in the electron carbocation, it can absorb light to excite low energy electrons in the hole (or to excite the hole in a lower position, if you want), unlike the neutral oil, in which first excited states have electrons in antibonding orbitals and thus have very high energies. The more conjugated compound is closer are its energy levels. This means that the carbocations formed in this test by naphthalene were more closely spaced energy levels than those corresponding to benzene. A photon energy is proportional to its frequency. Therefore, the frequency of light absorbed by the carbocation naphthalene is lower than the frequency of light absorbed by the benzene carbocation – the first absorbs red / orange light, while the latter absorbs blue / green light. Hence the colors we see are complementing this – blue and red / orange, respectively.

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