PROBLEM 1-10 Use resonance structures to identify the areas of high and low electron density in the following compounds: (a) H2C=CH-NO, (b) H2C=CH-C=N (c) H-C-NH2 (d) (e) () СН30—СН—СН—CN H-C-OCH3 H-C-CH=CH–NH2

Organic Chemistry: A Guided Inquiry
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ISBN:9780618974122
Author:Andrei Straumanis
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Chapter5: Resonance
Section: Chapter Questions
Problem 6CTQ
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I am wondering why there is a need for resoance structures if the molecule already has a neutral charge. Wouldn't these all be insignificant resonance structures (as there is unnecessary charge separation)? Perhaps they are only depicting these structures for the purpose of showing high/low electron density (which was what the question was asking for)? 

1 picture shows answer, another shows problem (it is (b)). 

PROBLEM 1-10
Use resonance structures to identify the areas of high and low electron density in the
following compounds:
(а) H-С—СH—NO2
(b) H2C=CH -C=N
(с)
H-C-NH2
(d)
(е)
(f) CH,0—СH— CH—CN
Н-С—ОСНз
Н-—С—СНЕCH—NH,
Transcribed Image Text:PROBLEM 1-10 Use resonance structures to identify the areas of high and low electron density in the following compounds: (а) H-С—СH—NO2 (b) H2C=CH -C=N (с) H-C-NH2 (d) (е) (f) CH,0—СH— CH—CN Н-С—ОСНз Н-—С—СНЕCH—NH,
=c-cEN:
H-C=c-č=
+ H-č-c=c=
H-C=C-CEN:
(b)
нН minor
H H
minor
нн
lower electron density
Chigher electron density
H-C=C-CEN;
нн
Transcribed Image Text:=c-cEN: H-C=c-č= + H-č-c=c= H-C=C-CEN: (b) нН minor H H minor нн lower electron density Chigher electron density H-C=C-CEN; нн
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