Which one of the following compounds will have the highest wavenumber for the C=C absorption?

Question

Quizplus · Accepted Answer

The wavenumber for the C=C absorption is affected by the electronic environment surrounding the double bond. Compounds I, II, and V have electron-withdrawing groups on one side and electron-donating groups on the other side of the double bond, which results in resonance, delocalization of pi electrons, and a lower wavenumber absorption. Compound IV has a triple bond, which results in a higher wavenumber absorption. Compound III, on the other hand, has two electron-withdrawing groups on both sides of the double bond, which results in a stronger pi bond and a higher wavenumber absorption. Therefore, compound III will have the highest wavenumber for the C=C absorption.

Which One of the Following Compounds Will Have the Highest