(a) The allyl anion has an unshared electron pair on the allylic carbon:

This anion has two more π electrons than the allyl cation. Use the molecular orbital diagram in Fig. 15.14b to decide which molecular orbital these “extra electrons” occupy.

(b) According to the molecular orbital description, which carbons of the allyl anion bear the negative charge?

(c) Show that the same conclusion can be reached by drawing resonance structures of the allyl anion. Use the curved-arrow notation.

Transcribed Image Text:

H₂C=CH-CH₂ allyl anion