С-Н -2800 – 3100 C=0 ~1700 – 1800 С-О ~1000 – 1200 1 a) What chemical bond is present in Unknown 1: 1 b) What chemical bond is present in Unknown 2: 1 c) Based on this, which compound can we assume is not one of the unknowns?
Electronic Effects
The effect of electrons that are located in the chemical bonds within the atoms of the molecule is termed an electronic effect. The electronic effect is also explained as the effect through which the reactivity of the compound in one portion is controlled by the electron repulsion or attraction producing in another portion of the molecule.
Drawing Resonance Forms
In organic chemistry, resonance may be a mental exercise that illustrates the delocalization of electrons inside molecules within the valence bond theory of octet bonding. It entails creating several Lewis structures that, when combined, reflect the molecule's entire electronic structure. One Lewis diagram cannot explain the bonding (lone pair, double bond, octet) elaborately. A hybrid describes a combination of possible resonance structures that represents the entire delocalization of electrons within the molecule.
Using Molecular Structure To Predict Equilibrium
Equilibrium does not always imply an equal presence of reactants and products. This signifies that the reaction reaches a point when reactant and product quantities remain constant as the rate of forward and backward reaction is the same. Molecular structures of various compounds can help in predicting equilibrium.
![A student is trying to determine the identity of two unknown compounds. The student is told that
unknown 1 and 2 are among the following compounds:
н он
H
*****
***
нн
H
C-c c-C.
't-d CH HC
HC=c
H
H
C-C
'E-d CH HC
-cc-C
t-d
=CH
HC-c-OH HC-
0,N-CCH HCě
HC
c=CH HC:
Fluorene
Fluorenone
Fluorenol
4-Nitrophenol
Coumarin
To start, the student decides that getting an IR spectrum of both unknown compounds will help
them identify what chemical bonds are present. For both spectra, the most important peaks have
been indicated with an arrow.
Unknown 1:
Unknown 2:
2000 e
1500
1000
3500
3000
1500
1000
VENUERl
WAVENUMBER (cm-1)
WAVENUMBER [cm-1]
Stretching Bond
Wavenumber (cm-1)
-3200 – 3550 (broad)
О-Н
С-Н
-2800 – 3100
C=O
-1700 – 1800
С-О
~1000 – 1200
1 a) What chemical bond is present in Unknown 1:
1 b) What chemical bond is present in Unknown 2:
1 c) Based on this, which compound can we assume is not one of the unknowns?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F84577f47-6855-4e4f-91d0-241ebc051b86%2F65f50e7b-9524-41f1-b1ae-4044a293722b%2Fcxe10n7_processed.jpeg&w=3840&q=75)
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