Doubt from halides

#1

Q no:111
Given ans:b)
My doubt:My thought was Y easily undergoes E2(anti elimination) and forms benzene(stable compound)followed by z where two eliminations are possible then x where no elimination is possible.
Pls explain where I go wrong here.

#2

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#3

Thanks a lot ..sry I considered dehalogenation in above instead of dehydrohalogenation.
Thanks a lot sir

#4

Sometimes it happen
But remember we you solve question and it’s get wrong then go through your notes.

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