Are these pairs of structures resonance forms?

a. Both pairs 1 and 2 represent resonance forms.

b. Both pairs are not resonance forms.

c. The structures in 1 are resonance forms while the structures in 2 are not.

d. The structures in 2 are resonance forms while the structures in 1 are not.

e. I don’t know.

C C

H

H H

C

O

H

C C

H

H H

C

O

H

C C

C HH

H

H

C

H

H

H

H

C C

C HH H

H

C

H

H

H

H

#1

#2

• The next three slides cover the next most important resonance form of formamide. The 3rd slide shows the correct structure of the resonance form.

• For the following structure– Push the N lone pair electrons towards the C.– Push any other electrons necessary.– Draw the new resonance form.

H

N

H

C

O

H

• How many sets of lone pair electrons are around the N?

• How many sets of lone pair electrons are around O?

• How many bonds does C have?

Enter the answer to all 3 sequentially. 034

H

N

H

C

O

H

H

N

H

C

O

H

Which resonance form is more important?

a. left b. right c. equally important

d. I don’t know

H C N H H C N H

Which resonance form is more important?

a. left b. right c. equally important

d. I don’t know

H C

H

H

N C OH C

H

H

N C O

Which resonance form is more important?

a. left b. right c. equally important

d. I don’t know

H

C

H

C

C

H

O

HH

C

H

C

C

H

O

H

For the structure given, choose the next most important resonance form. (Your structure may be more important than or equal to the one given.)

C

C

C

C

C

C

N

HH

HH

H

H

H

C

C

C

C

C

C

N

HH

a.

H

H

H

H

H

b.

C

C

C

C

C

C

N

HH

H

H

H

HH

c.

C

C

C

C

C

C

N

HH

HH

H

H

H

d.

C

C

C

C

C

C

N

HH

HH

H

H

H

e. a and c are equal

For the structure given, choose the least important resonance form.

C

C

C

C

C

C

N

HH

HH

H

H

H

C

C

C

C

C

C

N

HH

a.

H

H

H

H

H

b.

C

C

C

C

C

C

N

HH

H

H

H

HH

c.

C

C

C

C

C

C

N

HH

HH

H

H

H

d.

C

C

C

C

C

C

N

HH

HH

H

H

H

e. a and c are equal