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USNCO 2013 - 60

Can anyone tell me how to approach this question from USNCO 2013?

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The question boils down to: which molecule has the longest conjugated $\pi$-system? The answer is (A). For such a system, the particle-in-a-box model is a decent approximation and one can show that larger systems absorb at lower energies, i.e. longer wave-lengths.

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