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The nitrogen atom in the following cycli...

The nitrogen atom in the following cyclic compounds can be removed as trimethylamine by successive Hoffmann eliminations (involving exhaustive methylation followed by heating with `AgOH`). The amine which will require a greater number of Hoffmann eliminations is:

A

B

C

D

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The correct Answer is:
B
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Only one the following amines will lose its nitrogen atom as trimehyl amine by repeated Hofmann elimination reactions:

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