Question

21. An unknown compound (A) has a
molecular formula C4H6When (A) is treated
with excess of Br2 a new substance (B) with
formula C4H6Br4 is formed. (A) forms a
white ppt. with ammonical AgNO3
solution, A may be
1) But-1-yne 2) But-2-yne
3) But-1-ene 4) But-2-ene​

Answer 1

1) but1yne

As only terminal alkynes gives test with ammonical agno3 therefore a is the correct answer