Which of the following is the correct assignment of the names of the polymers shown?
question
120 pm
answer
Approximately how long is a carbon-carbon triple bond of an alkyne?
question
sp + sp; p + p; p + p
answer
Which atomic orbitals overlap to form the carbon-carbon triple bond of an alkyne?
question
2-methyl-3-heptyne
answer
What is the IUPAC name of the following compound?
question
3,4-dimethyl-1-hexen-5-yne
answer
What is the IUPAC name of the following compound?
question
3
answer
What is the major organic product obtained from the following reaction?
question
3 moles of NaNH2 followed by H3O+
answer
What is the best choice of reagent(s) to perform the following transformation?
question
2 moles of HBr
answer
What is the best choice of reagent to perform the following transformation?
question
1 mole of Br2
answer
What is the best choice of reagent(s) to perform the following transformation?
question
H2SO4, H2O, HgSO4
answer
What is the best choice of reagent(s) to perform the following transformation?
question
BH3, THF; followed by H2O2, H2O, NaOH
answer
What is the best choice of reagent(s) to perform the following transformation?
question
1
answer
What is the major organic product obtained from the following sequence of reactions?
question
2
answer
What is the major organic product obtained from the following sequence of reactions?
question
BH3, THF; followed by H2O2,H2O, NaOH
answer
What is the best choice of reagent(s) to perform the following transformation?
question
H2/Lindlar's catalyst
answer
What is the best choice of reagent(s) to perform the following transformation?
question
Li, NH3, MeOH
answer
What is the best choice of reagent(s) to perform the following transformation?
question
2
answer
What is the major organic product obtained from the following sequence of reactions?
question
3 < 4 < 2 < 1
answer
What is the correct order of increasing pKa for the following compounds? (low pKa < high pKa) 1, H3C-CH3 2, H2C=CH2 3, HC?CH 4, NH3
question
2,2,3,3-tetrabromohexane
answer
What is the major organic product obtained from the following sequence of reactions?
question
3
answer
What is the major organic product obtained from the following sequence of reactions?
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4
answer
What is the major organic product obtained from the following reaction?
question
III
answer
Which part(s) of the following energy diagram represent(s) the intermediate(s)?
question
I
answer
Which part of the following energy diagram best represents the heat of the reaction (DH)?
question
False
answer
The reaction shown in the following energy diagram cannot occur.
question
Intermediates can be observed and sometimes isolated.
answer
Which of the following statements is true?
question
True
answer
Markovnikov's rule predicts that some products will be formed regioselectively over others.
question
D
answer
Which of the following structures represents the most stable carbocation?
question
oxymercuration,hydroboration-oxidation
answer
Which of the following reactions is stereospecific?
question
False
answer
The following energy diagram is representative of the addition of hydrogen halides to an alkene.
question
II
answer
Which of the following reactions involve a two-electron, three-center intermediate?
question
H2SO4 , H3PO4 , H3O+
answer
Which set of reagents will satisfy the following transformation?
question
False
answer
The alkene shown in the following reaction has undergone a reduction.
question
The intermediate undergoes a carbocation rearrangement.
answer
Which of the following best explains why 3-methylbutene yields 2-bromo-2-methylbutane rather than 2-bromo-3-methylbutane upon reaction with HBr?
question
False
answer
The following reaction will proceed as shown.
question
There is not enough information to know which product yields the larger heat of hydrogenation.
answer
Which of the following statements is true?
question
False
answer
If two isomeric alkenes react with H2 to yield the same product, the one that releases more energy in its hydrogenation reaction is the more stable alkene.
question
False
answer
The following reaction represents an oxidation of molecular bromine.
question
B, C, A
answer
Arrange the following alkenes in order of least stable to most stable.
question
3
answer
How many products are formed in the following reaction?
question
1
answer
How many products will be formed in the following reaction?
question
There exist nonbonded interactions that prevent attack at both faces of the double bond.
answer
It is known that alkenes are planar about their double bonds and electrophilic additions commonly occur from both faces of the double bond. What, then, would be a reasonable explanation for the uneven product ratios observed in the following reaction?
question
True
answer
The secondary carbocation below would be predicted to be more stable than the tertiary carbocation shown.
question
reduced
answer
When sodium metal is reacted with an alkyne in liquid ammonia, the alkyne is:
question
False
answer
Sodium hydroxide can be used as a base in the following reaction.
question
None of the above is true.
answer
Select the statement that is true. (about pent being soluble or dense)
question
2 Br2
answer
Select the reagent for effecting the following transformation.
question
True
answer
Bromonium ions are intermediates in the reaction of alkynes with molecular bromine.
question
False
answer
The following transformation can be accomplished as illustrated.
question
C6H12
answer
Which of the following cannot be an alkyne?
question
False
answer
The following reaction will occur as illustrated.
question
6-methyl-2-octyne
answer
Determine the IUPAC name for the following molecule.
question
True
answer
A terminal alkyne is considerably more acidic than a terminal alkene.
question
1.21 E
answer
What is the typical bond length of a carbon-carbon triple bond?
question
because it has more s character
answer
Why is the C-H bond of a terminal alkyne shorter than that of an alkene or an alkane?
question
False
answer
The bond dissociation energies of triple, double, and single carbon-carbon bonds are 377 kJ/mol, 720 kJ/mol, and 837 kJ/mol, respectively.
question
(R)-6-octyn-2-ol
answer
Determine the IUPAC name for the following molecule.
question
NaOtert-Bu (1 equivalent)
answer
Select the best reagent for effecting the following transformation.
question
2,6-octadiyne
answer
Determine the IUPAC name for the following molecule.
question
False
answer
The reaction of mercury(II) salts with alkynes does not form bridged mercurinium ions because angle strain prevents the three-center/two-electron bond from forming.
question
2
answer
How many products will result from the following reaction?
question
5,5-dimethyl-1-hepten-6-yne
answer
Determine the IUPAC name for the following molecule.
question
The haloalkane is too hindered for substitution. & The acetylide ion is a strong base.
answer
Why won't the following transformation occur as shown?
question
False
answer
The following transformation can be accomplished as illustrated.
question
True
answer
Two allenes can be formed in the reaction shown.
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