\(CH \equiv C - CH = C{H_2} + {H_2}\xrightarrow{{Pd,{t^o}}}C{H_2} = CH - CH = C{H_2}\)
\(nC{H_2} = CH - CH = C{H_2}\xrightarrow{{{t^o}}}{( - C{H_2} - CH = CH - C{H_2} - )_n}\)
\(CH \equiv C - CH = C{H_2} + 2{H_2}\xrightarrow{{Ni,{t^o}}}C{H_3} - CH_2 - CH = C{H_2}\)
\(C{H_3} - C{H_2} - CH = C{H_2} + {H_2}\xrightarrow{{Ni.{t^o}}}C{H_3} - C{H_2} - C{H_2} - C{H_3}\)