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JEE Advanced levelSingle correct optionDifficulty 3 of 3g1051

In methyl vinyl ether, , the terminal carbon is the most electron-rich carbon because

  1. Athe methyl group donates electrons to the terminal carbon
  2. Bthe -I effect of the oxygen pushes electrons to the terminal carbon
  3. Cthe C=C bond is polarised toward the carbon attached to oxygen
  4. Dthe oxygen lone pair is donated by resonance (+M) to the beta carbon, outweighing the -I effect

Answer: D

The oxygen lone pair is conjugated with the C=C and gives as a contributor, which places negative charge on the terminal carbon. Here the +M effect outweighs the -I effect for the pi system, so electrophiles attack the terminal .
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