Doubt in elimination reaction

#1


doubt in product B plz help @Shaquib sir

#2

I think there is misprint N(Ch3)2 should have there instead of N(CN3)2

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#3

May be. But pls see what will be product B . I am not able to go through right mechanism

#4

I think you can solve this by the help of option also.see h2O2 will remove Nitrogen group and from alcohol there and after heating it will form pie bond by removing H not D because removing D will require more energy.
Answer will be A

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#5

I got it thanks .