Problem: Write resonance forms that describe the distribution of electrons in each of these molecules or ions.the allyl ion:

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We are being asked to identify the resonance forms that describe the distribution of electrons in allyl anion (C3H5-). 

We will have to draw the Lewis Structure of C3H5- first.


Step 1: Determine the central atom in this molecule.

 •  H is less electronegative than C but H can only make one bond
 •  C are the 
central atoms and is bonded to the H atoms


Step 2: Calculate the total number of valence electrons present.          

C3H5-:

          Group              Valence Electrons

C          4A                    4 valence e x 3
H          1A                    1 valence e x 5
                                      = 17 valence e

      -1 charge                     +1 e­-

 Total = 18 valence e-


Step 3: Draw the Lewis Structure for the molecule

•  C → prefers to have a complete octet (8 e- around them)

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Problem Details

Write resonance forms that describe the distribution of electrons in each of these molecules or ions.

the allyl ion:

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