(a) Interpretation: The resonance structure of OCN − needs to be drawn and the formal charges needs to be assigned. Concept introduction: Resonance structures are defined as a set of two or more Lewis structures that explain electronic bonding. Resonance structure can explain the delocalized electrons that cannot be signified by a single Lewis formula with an integer number of covalent bonds.
(a) Interpretation: The resonance structure of OCN − needs to be drawn and the formal charges needs to be assigned. Concept introduction: Resonance structures are defined as a set of two or more Lewis structures that explain electronic bonding. Resonance structure can explain the delocalized electrons that cannot be signified by a single Lewis formula with an integer number of covalent bonds.
Solution Summary: The author defines resonance structures as a set of two or more Lewis structures that explain electronic bonding.
The resonance structure of OCN− needs to be drawn and the formal charges needs to be assigned.
Concept introduction:
Resonance structures are defined as a set of two or more Lewis structures that explain electronic bonding. Resonance structure can explain the delocalized electrons that cannot be signified by a single Lewis formula with an integer number of covalent bonds.
Interpretation Introduction
(b)
Interpretation:
The OCN− resonance hybrid that makes the greatest contribution and which represents least contribution needs to be determined.
Concept introduction:
Resonance structures are defined as a set of two or more Lewis Structures that explain electronic bonding. Resonance structure can explain the delocalized electrons that cannot be signified by a single Lewis formula with an integer number of covalent bonds.
Interpretation Introduction
(c)
Interpretation:
Whether OCN− is linear or bent needs to be determined.
Concept introduction:
Resonance structures are defined as a set of two or more Lewis Structures that explain electronic bonding. Resonance structure can explain the delocalized electrons that cannot be signified by a single Lewis formula with an integer number of covalent bonds.
Interpretation Introduction
(d)
Interpretation:
The hybrid orbitals used by the C atom and the number of pi bonds C formed needs to be determined.
Concept introduction:
Resonance structures are defined as a set of two or more Lewis Structures that explain electronic bonding. Resonance structure is capable of explaining the delocalized electrons that cannot be signified by a single Lewis formula with an integer number of covalent bonds.
These are synthesis questions. You need to show how the starting material can be converted into
the product(s) shown. You may use any reactions we have learned. Show all the reagents you
need. Show each molecule synthesized along the way and be sure to pay attention to the
regiochemistry and stereochemistry preferences for each reaction. If a racemic molecule is made
along the way, you need to draw both enantiomers and label the mixture as "racemic".
All of the carbon atoms of the products must come from the starting material!
?
H
H
Q5: Draw every stereoisomer for 1-bromo-2-chloro-1,2-difluorocyclopentane. Clearly show
stereochemistry by drawing the wedge-and-dashed bonds. Describe the relationship
between each pair of the stereoisomers you have drawn.
Classify each pair of molecules according to whether or not they can participate in hydrogen bonding with one another.
Participate in hydrogen bonding
CH3COCH3 and CH3COCH2CH3
H2O and (CH3CH2)2CO
CH3COCH3 and CH₂ CHO
Answer Bank
Do not participate in hydrogen bonding
CH3CH2OH and HCHO
CH3COCH2CH3 and CH3OH
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INTRODUCTION TO MOLECULAR QUANTUM MECHANICS -Valence bond theory - 1; Author: AGK Chemistry;https://www.youtube.com/watch?v=U8kPBPqDIwM;License: Standard YouTube License, CC-BY