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B
hexa-1,4-diene
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C
hexa-1,5-diene
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D
hexa-2,5-diene
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Solution
The correct option is C hexa-1,5-diene Start with numbering the atoms that part of the ring. Hofmann elimination ensues and the carbons 2 and 3 get a double bond.
The product shown above could further undergo Hofmann elimination such that the carbons 6 and 7 get a double bond:
Overall, the elimination happens such that the bonds between Nitrogen and carbons 2 and 7 are both certainly broken.