Na Br;ультрф. св. KOH(спирт. раств.)
C2H6------>x1----->бутан--------------------------->x2------------------------------->x3---->CH3-CH-CH-CH3
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OH OH

С2H6+Br2 -> C2H5Br+HBr2C2H5Br+2Na->C4H10+2NaBrCH3-CH2-CH2-CH3 + Cl2 -> CH3-CHCl-CH2-CH3+HCl(X2)CH3-CHCl-CH2-CH3+Cl2->CH3-CHCl-CHCl-CH3+HCl(X3)CH3-CHCl-CHCl-CH3+2KOH-> CH3-CHOH-CHOH-CH3+2KCl