1)2CH4-----t---> C2H2+3H2

2)C2H2 + H2O - Hg2+------>CH3COH 

3)CH3COH →---Ag2O---→H2O+CO2+2Ag

4)CH2=CH2+H2O → CH3-CH2OH 
5)CH3-OH+HO-CH3 →--- H2SO4--→ CH3-O-CH3