IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry - gud Qstin - tell what the product is --

harsha_27

First notice few things here

1.Nucleophile is bulky, so it is a very good base than a nucleophile(just like potassium ter-butoxide).

2.The carbon attached to Br is vinylic,I mean vinylic bonds are very strong and do not break that easily.

So I think elimination predominates substitution here.

The major product will be an E2 based Dehydrohalogenation.

So H-C

C-H ,acetylene, will be the major product.