C3H4+H2=.......+Cl2=.......+NaOH=......+H2=.....

1) CH≡C-CH3 + 2H2 -> CH3-CH2-CH3
2) CH3-CH2-CH3 + Cl2 -> CH3-CHCl-CH3 + HCl
3) CH3-CHCl-CH3 + NaOH (спирт. р-р) -> CH2=CH-CH3 + NaCl + H2O
4) CH2=CH-CH3 + H2 -> CH3-CH2-CH3