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Example Questions
Example Question #211 : Organic Concepts
By which characteristic do resonance structures of a molecule differ?
Molecular formula
Hybridization
Rotation around sigma bonds
The position of the electrons
The position of the electrons
By definition, resonance structures are multiple Lewis structures that depict the same molecular compound. The only difference pertains to the way in which electrons are shared by atoms in the molecule. Molecules are weighted averages of their most stable resonance contributors.
Example Question #6 : Help With Other Biological Molecules
Which of the atoms in the molecules below is/are sp2 hybridized?
1, 3 and 5
3 only
1 and 5
2 and 4
1 and 4
1, 3 and 5
The boron in 2 is sp3 hybridized because of its four substituents and the carbon in 4 is sp hybridized because of its connection to only the nitrogen with a single .
Example Question #7 : Help With Other Biological Molecules
How many isoprene units does the given molecule, alpha-pinene, have?
None - it is not a terpene
Alpha-pinene is a terpene, and is thus composed of isoprene units. A single isoprene unit has 5 carbon atoms. This molecule has 10 carbons, thus it contains 2 isoprene units.
Example Question #41 : Biological Molecules
What class of biological molecule is the given compound?
Amino acid
Carbohydrate
Steroid
Nucleic acid
Fatty acid
Steroid
This is cholic acid, a steroid. Steroids can be easily identified by their characteristic fused ring structures.
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