Indietro
Bruice 8th EditionCh. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of BenzeneProblema 69b
Which ion in each of the following pairs is more stable?
b.
Problema 69c
Which ion in each of the following pairs is more stable?
c.
Problema 69d
Which ion in each of the following pairs is more stable?
d.
Problema 71a,b
Which resonance contributor in each pair makes the greater contribution to the resonance hybrid?
a.
b.
Problema 71c
Which resonance contributor in each pair makes the greater contribution to the resonance hybrid?
c.
Problema 71d
Which resonance contributor in each pair makes the greater contribution to the resonance hybrid?
d.
Problema 73a
Which oxygen atom has the greater electron density?
Problema 73b
Which compound has the greater electron density on its nitrogen atom?
Problema 73c
Which compound has the greater electron density on its oxygen atom?
Problema 74
Which compound is the strongest base?
Problema 75
Which loses a proton more readily: a methyl group bonded to cyclohexane or a methyl group bonded to benzene?
Problema 77a
The A ring of cortisone (a steroid) is formed by a Diels–Alder reaction using the two reactants shown here. What is the product of this reaction?
Problema 77b
The C ring of estrone (a steroid) is formed by a Diels–Alder reaction using the two reactants shown here. What is the product of this reaction?
Problema 79
Rank the following carbocations from most stable to least stable:
Problema 81a,b
Which species in each of the pairs in Problem 80 is the stronger base?
a.
b.
Problema 82
Purine is a heterocyclic compound with four nitrogen atoms.
a. Which nitrogen is most apt to be protonated?
b. Which nitrogen is least apt to be protonated?
Problema 85
Rank the indicated hydrogen in the following compounds from most acidic to least acidic:
Problema 86a
Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene:
a. How many MOs does the compound have?
Problema 86b
Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene:
b. Which are the bonding MOs, and which are the antibonding MOs?
Problema 86c
Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene:
c. Which MOs are symmetric, and which are antisymmetric?
Problema 86d
Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene:
d. Which MO is the HOMO and which is the LUMO in the ground state?
Problema 86e
Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene:
e. Which MO is the HOMO and which is the LUMO in the excited state?
Problema 86f
Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene:
f. What is the relationship between HOMO and LUMO and symmetric and antisymmetric orbitals?
Problema 86g
Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene:
g. How many nodes does the highest-energy MO of 1,3,5,7-octatetraene have between the nuclei?
Problema 87
How could you synthesize the following compound from starting materials containing no more than six carbons?
Problema 88
A student obtained two products from the reaction of 1,3-cyclohexadiene with Br2 (disregarding stereoisomers). His lab partner was surprised when he obtained only one product from the reaction of 1,3-cyclohexadiene with HBr (disregarding stereoisomers). Account for these results.
Problema 89a
How could the following compounds be synthesized using a Diels–Alder reaction?
a.
Problema 89b
How could the following compounds be synthesized using a Diels–Alder reaction?
b.
Problema 89c
How could the following compounds be synthesized using a Diels–Alder reaction?
c.
Problema 89d
How could the following compounds be synthesized using a Diels–Alder reaction?
d.
