In which case is the indicated unshared pair of electrons NOT a contributor to t

Question

In which case is the indicated unshared pair of electrons NOT a contributor to the pi aromatic system? Which dibromobenzene can, in theory, yield three mononitro derivatives? o-Dibromobenzene m-Dibromobenzene p-Dibromobenzene All of these None of these A dichlorobenzene that on reaction with nitric acid and sulfuric acid might theoretically yield three mononitro products would be: o-Dichlorobenzene m-Dichlorobenzene p-Dichlorobenzene None of these All of these Cyclopentadiene is unusually acidic for a hydrocarbon. An explanation for this is the following statement. The carbon atoms of cyclopentadiene are all sp^2-hybridized. Cyclopentadiene is aromatic. Removal of a proton from cyclopentadiene yields an aromatic anion. Removal of a hydrogen atom from cyclopentadiene yields a highly stable free radical. Removal of a hydride ion from cyclopentadiene produces an aromatic cation.

Explanation / Answer

8. The unshared pair is not a contributor in pi-aromatic system of ,

B) II

9. In theorey the compound which yields three mononitro derrivatives would be,

B) m-dibromobenzene

10. A dibromo which yields three products upon nitration is,

B) m-dibromobenzene

11. Cyclopentadiene is unusually acidic for a hydrocarbon due to the fact that,

C) removal of a proton from cyclopentadiene yields an aromatic anion.

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