(a)
Interpretation:
The number of tetrahedral carbons in dihydroxyacetone should be calculated.
Concept Introduction:
Lewis structures are the diagrams that show the bonding between the atoms of the molecules and existing lone pairs of electrons.
- Bonding electrons are those electrons that are shared between the atoms resulting in the formation of bond.
- Non-bonding electrons are the valence electrons of the atom which are not shared with another atom.
Lewis structures can be used to determine the shape around an atom in a molecule.
The shape around the given atom is determined by the number of groups surrounding the atom.
A group is either an atom or a lone pair of electrons. Then can use the valence shell electron pair repulsion (VSEPR) theory to determine the shape. VSEPR is based on the fact that electron pairs repel each other; thus,when groups are as far away from each other as possible then they are in the most stable arrangement.
In order to have tetrahedral geometry, carbon atom should be surrounded by four groups of atoms.
(b)
Interpretation:
The number of trigonal planner carbons does dihydroxyacetone contains should be calculated.
Concept Introduction:
Lewis structures are the diagrams that show the bonding between the atoms of the molecules and existing lone pairs of electrons.
- Bonding electrons are those electrons that are shared between the atoms resulting in the formation of bond.
- Non-bonding electrons are the valence electrons of the atom which are not shared with another atom.
Lewis structures can be used to determine the shape around an atom in a molecule.
The shape around the given atom is determined by the number of groups surrounding the atom.
A group is either an atom or a lone pair of electrons. Then can use the valence shell electron pair repulsion (VSEPR) theory to determine the shape. VSEPR is based on the fact that electron pairs repel each other; thus, when groups are as far away from each other as possible then they are in the most stable arrangement.
In order to have trigonal planar geometry, carbon atom should be surrounded by three groups of atoms.

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Chapter 4 Solutions
ALEKS 360 ACCESS CARD F/GEN. ORG.CHEM
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