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In this question i understand that we have to break C- N bond. But which one to choose?enter image description here

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  • $\begingroup$ If the question has been sufficiently answered, please accept it! $\endgroup$ – HappyFeet Me Apr 5 at 7:43
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This is an example of Cope Elimination where the base takes up hydrogen from the least sterically hindered Carbon atom to avoid crowding in the Transition state. Hence, Hoffman Alkene is obtained and ethene is formed.

The reaction is not an example of E1cb since the Leaving Group is a stable alkene whereas the basic requirement for a reaction to be categorised as E1cb is that the leaving group should be a weak base.

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