CH3COONa --> CH4 --> CH4Br --> C2H6 --> C2H5Cl --> C4H10 --> C4H8 --> C4H10

CH3COONa+NaOH->CH4+Na2CO3CH4+ Br2-> CH3Br+ HBr2CH3Br+ 3Na -> CH3-CH3 + 2NaBrC2H6 + Cl2-> C2H5Cl + HCl2C2H5Cl + 2Na -> C4H10 + 2NaClC4H10 -> C4H8 + H2C4H8 + H2-> C4H10