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Which mechanism will the following reaction follow?

enter image description here

Will it follow E2 mechanism? If yes, then how would 2,3-dibromobutane undergo this reaction?

Does it form both cis and trans butene or is the product butyne?

Here is a link to a website that has mentioned it is E2 mechanism but has low stereospecificity. So does Zn act as the base donating the electrons? If this happens then why isn't hydrogen leaving the substrate resulting in dehydrohalogenation and formation of alkyne? Why are two halogens leaving the substrate to give an alkene instead of alkyne

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  • $\begingroup$ A repost of a closed question will be closed as well. The proper way is to address the closure reason by editing of the original question and asking to reopen it. $\endgroup$
    – Poutnik
    Commented Dec 24, 2020 at 12:05
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    $\begingroup$ Now it depends on reagents you use. You need to provide a point where you feel yourself to be unsatisfied. Now there are multiple ways using a bulky and a strong base, using NaI acetone, Using Alcoholic KOH. So you need to specify the reagents also as different reagents follow different mechanisms $\endgroup$
    – user99515
    Commented Dec 24, 2020 at 14:14
  • $\begingroup$ I had provided a whole explanation on what I was unsatisfied. I even requested that an elaborate question was necessary for the contributors to understand what doubt I had. $\endgroup$
    – Desai
    Commented Dec 24, 2020 at 15:22
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    $\begingroup$ Well, moderators of any moderated sites are not very happy with users posting questions before getting familiar with the site policy. It seems to me you have confused too broad with too deep, so instead of narrowing it, you have ended with shallowing it. Site policies are for advantage of the whole SE community, which aims for the high-quality of answers AND questions. Without it, it would be like dozens of other topical sites ,mostly forums, with lots of garbage. $\endgroup$
    – Poutnik
    Commented Dec 24, 2020 at 15:59
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    $\begingroup$ BTW, they were not necessarily moderators, they could be as well senior users with Q close voting privilege. 5 such votes, with chosen reason, is enough for the Q to be closed. $\endgroup$
    – Poutnik
    Commented Dec 24, 2020 at 16:04

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