Worksheet 14 - Hybridization With Answers Page 5
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1
2
3
4
5The molecule shown to the left is riboflavin
(vitamin B2). Answer the following questions
H
about its structure.
H
O
C
H
3
8
a)
how many carbons are sp
hybridized?
H
C
H
O
2
10
H
H
sp
hybridized?
O
C
H
C
H
O
0
sp hybridized?
H
C
H
3
H
H
H
C
H
2
b)
How many nitrogens are sp
hybridized?
H
C
C
N
N
O
2
C
C
C
C
2
sp
hybridized?
H
H
C
C
C
N
0
C
C
N
C
H
sp hybridized?
H
H
H
O
3
4
c)
How many oxygens are sp
hybridized?
2
2
sp
hybridized?
0
sp hybridized?
How many σ bonds are there in total?
52
d)
How many π bonds are there in total?
7
e)
f)
Which of the three rings are planar?
The ring on the left, in which all carbon
2
atoms are sp
hybridized
-
The acetate ion, C
H
O
, has both oxygens bonded to the same carbon.
2
3
2
a)
Draw the Lewis structure and all resonance forms.
2
3
H
H
H
H
sp
sp
H
H
H
H
C
C
C
C
O
O
C
C
O
O
C
C
3
sp
H
H
H
H
O
O
O
O
2
sp
b)
Label the hybridization around each carbon.
c)
Pick one resonance structure and label the hybridization of each oxygen.
How many σ and π bonds are present?
6 sigma bonds, 1 pi bond
d)
the oxygen with 3 lone pairs
e)
Which atom carries the formal negative charge?
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