Объяснение:

4.
1) H3C-CH3 = H2C=CH2 + H2 (кат. Cr2O3, t)
2) H2C=CH2 + H2O = H3C-CH2OH
3) H3C-CH2OH + 3O2 = 2CO2 + 3H2O
4) CaO + CO2 = CaCO3
5) CaCO3 + 2HCl = CaCl2 + H2O + CO2

5.
Реакции с CH3COOH:
1) NaCO3 + CH3COOH = CH3COONa + H2O + CO2
2) CH3COOH + KOH = CH3COOK + H2O
3) 2CH3COOH + CaO = (CH3COO)2Ca + H2O
4) 2CH3COOH + Mg = (CH3COO)2Mg + H2

Реакции с H2SO4:
1) H2SO4 + Na2CO3 = Na2SO4 + H2O + CO2
2) H2SO4 + 2KOH = K2SO4 + 2H2O
3) H2SO4 + CaO = CaSO4 + H2O
4) H2SO4 + Mg = MgSO4 + H2