PhC≡CH Piperidine I2→ Product (A)
Product (A) is:
PhC(I)=CHI
PhCH(I)CH2I
IC≡CH
PhC≡CI
Piperidine
is a strong base so it can abs tract terminal H-atom.
PhC≡C−H;⟶ Piperdine Ph−C≡C⊖⟶I2
PhC≡C−I (A)