Resonance Structures Video Lessons

Concept:

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

###### FREE Expert Solution

We are being asked to identify the resonance forms that describe the distribution of electrons in pyridine, C5H5N

First, we will have to draw the Lewis Structure of pyridine.

Step 1: Determine the central atom in this molecule.

H is less electronegative than C or N but H can only make one bond

•C would also bond with either N or H forming a total of 4 bonds each C atom

• N would also bond with either C or H to form up to 4 bonds

•C and N would each be central atoms

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

C5H5N:

Group              Valence Electrons

C         4A                    4 valence e- x 5

N         5A                    5 valence e-

H         1A                    1 valence e- x 5

Total = 30 valence e-

Step 3: Draw the Lewis Structure for the molecule

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###### Problem Details

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

pyridine: