4а) CO2+2NaOH(конц)=Na2CO3+H2O
Na2CO3+2HCl(разб)=2NaCl+CO2+H2O
CO2+CaO=CaCO3 CaCO3=CaO+CO2
CaCO3+2HCl(разб)=CaCl2+CO2+H2O
CaCl2+2AgNO3=2AgCl+Ca(NO3)2
4б) CH3-CH2-CH2-OH+HCl(конц) = CH3-CH2-CH2-Cl + H2O
CH3-CH2-CH2-Cl = Ch3-CH=CH2 + HCl
CH3-CH=CH2+HI= CH3-CHI-CH3
CH3-CHI-CH3+NaOH(водный раствор)=CH3-CH(OH)-CH3+NaI
CH3-CH(OH)-CH3 = CH3-CH=CH2 + H2O
2CH3-CH=CH2 + 9O2= 6CO2 + 6H2O