1. Which of the following reactions best describes the Diels-Alder reaction? A)electrocyclic reaction B)cycloaddition reaction C)sigmatropic reaction D)radical reaction E)nucleophilic substitution reaction
Choose the correct option.
1. Which of the following reactions best describes the Diels-Alder reaction?
A)electrocyclic reaction
B)cycloaddition reaction
C)sigmatropic reaction
D)radical reaction
E)nucleophilic substitution reaction
2.Which of the following statements best describes the theory of Conservation of Orbital Symmetry?
A)Molecular orbital of the transition state must be similar to that of the reactant.
B)Molecular orbital of the transition state must be similar to that of the product.
C)Only s orbitals from reactants and products are utilized.
D)Molecular orbitals of reactant and product must have similar symmetry.
E)Molecular orbitals of reactant and product must have different symmetry.
3.Through what type of single pericyclic reaction did the reaction proceed? 5-methylcyclopenta-1,3-diene to 1-methylcyclopenta-1,3-diene
A)[1,2] sigmatropic hydrogen migration
B)[1,3] sigmatropic hydrogen migration
C)[1,4] sigmatropic hydrogen migration
D)[1,5] sigmatropic hydrogen migration
E)none of the above
4.Which of the following statements concerning the selection rules for pericyclic reactions is correct?
A)If TE describes the reaction,then the outcome is given by AC.
B)If PO describes the reaction,then the outcome is given by AC.
C)If TO describes the reaction,then the outcome is given by AC.
D)both A and B
E)none of the above
5.Describe a cycloaddition reaction.
A)The reactant has lost a sigma bond,the product has a new sigma bond,and the pi bonds have rearranged.
B)The product contains a new ring,with two less sigma bonds,and two more pi bonds than the starting material.
C)The product contains a new ring,with two more sigma bonds,and two less pi bonds than the starting material.
D)The product contains a new ring,with one less sigma bond,and one more pi bond than the starting material.
E)The product contains a new ring,with one more sigma bond,and one less pi bond than the starting material.
6.Describe an electrocyclic reaction.
A)The reactant has lost a sigma bond,the product has a new sigma bond,and the pi bonds have rearranged.
B)The product contains a new ring,with two less sigma bonds,and two more pi bonds than the starting material.
C)The product contains a new ring,with two more sigma bonds,and two less pi bonds than the starting material.
D)The product contains a new ring,with one less sigma bond,and one more pi bond than the starting material.
E)The product contains a new ring,with one more sigma bond,and one less pi bond than the starting material.
7.Describe a sigmatropic rearrangement.
A)A sigma bond in the reactant has moved to a different location in the product,and the pi bonds have rearranged.
B)The product contains a new ring,with two less sigma bonds,and two more pi bonds than the starting material.
C)The product contains a new ring,with two more sigma bonds,and two less pi bonds than the starting material.
D)The product contains a new ring,with one less sigma bond,and one more pi bond than the starting material.
E)The product contains a new ring,with one more sigma bond,and one less pi bond than the starting material.
8.Which of the following molecular orbitals is produced when in-phase atomic orbitals overlap?
A)a bonding molecular orbital
B)an antibonding molecular orbital
C)a nonbonding molecular orbital
D)an out-of-phase molecular orbital
E)an excited energy state of molecular orbital
9.Which of the following molecular orbitals are formed from subtractive overlap of atomic orbitals?
A)antibonding orbitals
B)out-of-phase orbitals
C)bonding orbitals
D)A and B
E)B and C
10.How many molecular orbitals are produced from the overlap of four p atomic orbitals?
A)2
B)8
C)4
D)16
E)1
11.How many π molecular orbitals does 1,3,5,7-octatetraene have?
A)2
B)4
C)6
D)8
E)10
12.How many nodes does the highest energy molecular orbital of 1,3,5,7-octatetraene have?
A)4
B)5
C)6
D)8
E)10
13.In the allyl radical,which π molecular orbital is singly occupied?
A)the bonding π molecular orbital
B)the nonbonding π molecular orbital
C)the antibonding π molecular orbital
D)none of the above
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