Cyclopentadiene Is Unusually Acidic for a Hydrocarbon

question 185

Multiple Choice

Cyclopentadiene is unusually acidic for a hydrocarbon.An explanation for this is the following statement.

• A)The carbon atoms of cyclopentadiene are all sp²-hybridized.
• B)Cyclopentadiene is aromatic.
• C)Removal of a proton from cyclopentadiene yields an aromatic anion.
• 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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Definitions:

Allonge

Accompanying a negotiable instrument, a piece of paper that provides room for an endorsement if no room is available on the instrument itself.

Instrument

A legal document that formalizes an agreement or right, such as a contract, will, or financial instrument.

Endorsement

The act of signing one's name on the back of a check or other negotiable instrument to legally transfer its ownership.

Blank Endorsement

An endorsement on a financial instrument, like a check, where the signature of the endorser is written but no specific endorsee is named, making it payable to the bearer.