Question Solved1 Answer The compound CH3CH = CHCHO has a strong absorption in theultraviolet at 46950 cm-1and a weak absorption at30000 cm-1. Justify these features in terms of thestructure of the molecule. Note: consider the terms of Pi ——> Pi^* and n ——-> Pi^* inevaluating this problem.

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The compound CH3CH = CHCHO has a strong absorption in the ultraviolet at 46950 cm-1and a weak absorption at 30000 cm-1. Justify these features in terms of the structure of the molecule.

Note: consider the terms of Pi ——> Pi^* and n ——-> Pi^* in evaluating this problem.

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The possible electronic  transitions in CH3-CH=CH-CHO are pi ----> pi*   and n-------> pi *. The n-------> pi* transition is less intense than pi----->pi* because the first one is a symmetry forbidden transition.  So a strong absorption band indicates the pi--->pi* transition.  The pi----> pi* transiti ... See the full answer