Chem 1101 2014-J-3 Worksheet With Answers - The University Of Sydney - 2014 Page 12
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21CHEM1101
2008-J-7
June 2008
Marks
Modern plants, algae and cyanobacteria contain a class of pigments called
4
chlorophyll. The structure of “chlorophyll a”, which absorbs both red and blue light,
is shown below.
a
O
O
CH
3
b
O
O
N
O
N
Mg
N
e
c
N
d
Draw the full Lewis structure of the functional group shown in box "a".
H
O
H
C
H
R
O
where ‘R’ represents the rest of the molecule
What type of functional group is it?
It is an ester.
Determine the local geometry of all other atoms bonded to each atom labelled on the
structure above, and complete the table below.
Site
b
c
d
e
*
Geometry
tetrahedral
trigonal planar
bent
tetrahedral
* remember that this carbon atom has 2 hydrogen atoms attached to it that are not shown in
the stick structure.
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