Explain why diethyl ether does not have a UV spectrum, even though it has lone-pair electrons.
Can we say that π* molecular orbital does not exist because there are no π-bonded electrons in diethyl ether?
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We can measure the UV-Vis spectra for π → π* or n → π* electronic transitions (other transitions are forbidden according to selection rule) [1, pp. 577–578]. But in diethyl ether, being a saturated compound, it has no π-bonds. This successfully dismisses the idea of having π* orbital. And, as there is no π* orbital, we can not have a transition to the π* orbital resulting in no UV-Vis absorption spectra.