`CH_3-CH=CHBr overset(NaNH_2) underset(Red hot iron tube) to ?`

CH_3-C-=C-CH-3 overset(NaNH_2)rarr'X' . What is X.?

3CH_(3)-C=Choverset(Red hot)underset(Cu tube)rarr

CH-=CHoverset(NaNH_(2))to[A]overset(CH_(3)Br)to[B]

In the following reaction, the product 'R' is: CaC_(2) overset(H_(2)O)to P overset("hot iron")underset("tube")to Q overset(CH_(3)Cl)underset(AlCl_(3))toR

Ph-overset(Cl)overset(|)underset(Cl)underset(|)(C)-CH_(3)overset(3NaNH_(2))(to)underset("product")((A)) , Product (A) is :