Pls exlain me this reactionOn reaction of1, 1, 1 trichloroethane with silver powder, 2butyne is obtained as the product.

Hence, the correct option is (1).

There is no known mechanism of the above mentioned reaction. There are many possibilities by which this reaction can occur. It can occur through concerted mechanism or can also occur through neighbouring group participation. Concerted reactions are those reaction in which here is no intermediate formation. The reaction occurs through transition state. In neighbouring group participation silver remove the bromide ion which further facilitate the reaction . Both type of reactions you will study in higher grades.