Unformatted text preview: 7‘: Cyclopentadiene is unusually acidic for a hydrocarbon. An
explanation for this is the following statement. A) The carbon atoms of cyclopentadiene are all spZ—hybridized.
B) Cyclopentadiene is aromatic. . _ _ . _
* C) Removal of a proton from cyclopentadiene yields an aromatic anlon.
D) Removal of a hydrogen atom from cyclopentadiene yields a highly
stable free radical.
E) Removal of a hydride ion from cyclopentadiene produces an aromatic cation.
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lr? The correct name for the compound shown below is:
A) ald—Dihromoaniline - D) 3,6-Dibromoaniline
B) 2,4-Dibromoaniline - E) 2,6—D1bromoan111ne * C) 2,5-Dibromoaniline 18’ Why would 1,; -cyclohexadiene undergo dehydrogenation readily?” A) It is easily reduced.
B) Hydrogen is a small molecule.
C) 1,3-Cyclohexadiene has no resonance energy.
* D) It would gain considerable stability by becoming benzene.
E) It would not undergo dehydrogenation. reactions. * B) All of the hydrogen atoms of benzene are equivalent. C) The carbon—carbon bonds of benzene are alternately short and long
around the ring. D) The benzene ring is a distorted hexagon.
E) None of the above éZC) Toluene is the name commonly assigned to: A) Hydroxybenzene D) Ethylbenzene
'9 B) Aminobenzene E) Methoxyhenzene
lJI * C) Methylhenzene ...
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- Spring '08