CH4=C2H2=CH3-COH=CH3-CH2OH=CH3-CH2-Br

CH4->C2H2->CH3-COH->CH3-CH2OH-> CH3-CH2-Br

2 CH4 = C2H2+3 H2

C2H2+H2O = CH3-COH

CH3-COH+H2 = CH3-CH2OH

CH3-CH2OH+HBr = CH3-CH2-Br