A model of naphthalene is given. The position of multiple bonds in it is to be shown. The number of possible resonance structures for naphthalene is to be stated and their structures are to be drawn. Concept introduction: Hydrogen is monovalent. Carbon is tetravalent and it can form four bonds. The position of double bonds can be identified by looking for carbons in the model having only three bonds. Resonance forms differ only in the placement of their π and nonbonding valence electrons. Neither the position nor the hybridization of any atom changes from one resonance form to another. The shift of electrons to give another resonance structure is represented by a curved arrow. To determine: The position of multiple bonds in the given model of naphthalene, C 10 H 8 . The number and structures of possible resonance structures for naphthalene are to be drawn
A model of naphthalene is given. The position of multiple bonds in it is to be shown. The number of possible resonance structures for naphthalene is to be stated and their structures are to be drawn. Concept introduction: Hydrogen is monovalent. Carbon is tetravalent and it can form four bonds. The position of double bonds can be identified by looking for carbons in the model having only three bonds. Resonance forms differ only in the placement of their π and nonbonding valence electrons. Neither the position nor the hybridization of any atom changes from one resonance form to another. The shift of electrons to give another resonance structure is represented by a curved arrow. To determine: The position of multiple bonds in the given model of naphthalene, C 10 H 8 . The number and structures of possible resonance structures for naphthalene are to be drawn
A model of naphthalene is given. The position of multiple bonds in it is to be shown. The number of possible resonance structures for naphthalene is to be stated and their structures are to be drawn.
Concept introduction:
Hydrogen is monovalent. Carbon is tetravalent and it can form four bonds. The position of double bonds can be identified by looking for carbons in the model having only three bonds. Resonance forms differ only in the placement of their π and nonbonding valence electrons. Neither the position nor the hybridization of any atom changes from one resonance form to another. The shift of electrons to give another resonance structure is represented by a curved arrow.
To determine:
The position of multiple bonds in the given model of naphthalene, C10H8. The number and structures of possible resonance structures for naphthalene are to be drawn
Expert Solution & Answer
Answer to Problem 20VC
The positions of multiple bonds in naphthalene are shown in the structure given below.
Naphthalene has three resonance forms as shown.
Explanation of Solution
In the model of naphthalene shown all the carbons have formed only three bonds and all the carbons require one more bond to satisfy their fourth valence. This fourth valence of each carbon can be satisfied by placing five double bonds between adjacent carbons as shown.
By shifting the position of double bonds, in total, three resonance structures can be drawn.
Conclusion
The positions of multiple bonds in naphthalene are shown in the structure given below.
Naphthalene has three resonance forms as shown.
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Write structural formulas for the major products by
doing addition reactions
1. You must add H2 as Pt is catalyst it does not take part in reactions
only speed up the process
H₂
CH2=CH-CH3
Pt
2. Add HCI break it into H and Cl
CH3
HCI
3. Add Br2 only CC14 is catalyst
CH3-CH=CH2
B12
CCl4
4. Add water to this and draw major product, H2SO4 is catalyst you have add
water H20 in both the reaction below
H₂SO4
CH3-CH=CH2
CH3
H2SO4/H₂O
CH3-C=CH2
reflux
?
Plan the synthesis of the following compound using the starting
material provided and any other reagents needed as long as
carbon based reagents have 3 carbons or less. Either the
retrosynthesis or the forward synthesis (mechanisms are not
required but will be graded if provided) will be accepted if all
necessary reagents and intermediates are shown (solvents and
temperature requirements are not needed unless specifically
involved in the reaction, i.e. DMSO in the Swern oxidation or
heat in the KMnO4 oxidation).
H
H
Hint These are benzene substitution reactions.
ALCI3 and UV light are catalyst no part in reactions and triangle A means
heating.
A. Add ethyl for Et in benzene ring alkylation reaction EtCl =
CH3CH2CL
1) EtC1 / AlCl3 / A
?
B: Add Br to benzene ring ( substitution)
2) Br₂ / uv light
?
C Add (CH3)2 CHCH2 in benzene ring ( substitution)
(CH3)2CHCH,C1 / AICI,
?
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