A Saturated polyhalogen compound (A) on heating with zinc gives 2-Butyne. What should be the minimum number of halogen in one molecule of the reactant (A) to give the product.

A Saturated polyhalogen compound (A) on heating with zinc gives 2-Buty

1.	A Saturated polyhalogen compound (A) on heating with zinc gives 2-Butyne. What should be the minimum number of halogen in one molecule of the reactant (A) to give the product.
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