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11 a)

CH3-CHO+Н2=CH3-CH2-OН

CH3-CH2-OH=C2H4+Н2О

C2H4=C2H2+Н2

C2H2+Н2О=CH3-CHO

b)

CH4 + Cl2 = CH3Cl + HCl

CH3Cl + KOH = CH3OH + KCl

CH3OH + CuO = Cu + H2O + HCOH

b)

CH4 + Cl2 = CH3Cl + HCl

CH3Cl + KOH = CH3OH + KCl

CH3OH + CuO = Cu + H2O + HCOH

HCOH + Ag2O = 2Ag + HCOOH

2HCOOH + O2 = 2CO2 + 2H2O