Identify the alkyne in the following sequence of reactions:
Alkyne `overset(H_(2))underset("Lindlar's catalyst")to(A)overset("Ozonolysis")to(B)overset("Wacker")underset("Process")(larr) (H_(2)C)=CH_(2)`

Identify the alkyne in the following sequence of reactions, Alkyne overset(H_(2))underset( "Lindlar's catalyst")to Aunderset("only") overset("Ozonolysis")toB overset("Wacke"r)underset("process")larr CH_(2)=CH_(2)

Identify the alkyne in the followin sequence of reactions "Alkyne" underset("Lindlar catalyst")overset(H_(2))to A overset("Ozonolysis")to B "Catalyst" underset("Process")overset("Wacker")to CH_(2)=CH_(2)

Xoverset(H_2)underset("Lindlar's catalyst")larr CH_3C-=C""CH_3overset(Na//liq.NH_3)toY

Identify (B) and (D) in the following sequence of reactions: H_(2)C = CH_(2) overset("conc". H_(2)SO_(4))to(A) overset(H_(2)O)underset(Delta)to (B) overset(PB_(3))to ( C)overset((D))to (H_(2)C=CH_(2))

The reaction, RC-=CR underset("Lindlar's catalyst")overset(H_(2))to Gives the main product as