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1) CaCO3 = CaO + CO2
CaO + 3C = CaC2 + CO
CaC2 + 2H2O --- CH≡CH + Ca(OH)2
CH≡CH + H2 CH2=CH2 
CH2=CH2 + Cl2  CH2Cl-CH2Cl
CH2Cl-CH2Cl +    Zn (t)--- CH2=CH2 + ZnCl2
СH2=CH2 + H2O CH3-CH2-OH

2) CH4 + Br2 CH3Br + HBr
2CH3Br + 2Na CH3-CH3 + 2NaBr
CH3-CH3 CH2=CH2 + H2
CH2=CH2 + H2O CH3-CH2-OH
CH3-CH2-OH (в присутствии H2SO4 конц)--- СH2=CH2 + H2O
3CH2=CH2 + 2KMnO4 + 4H2O 3CH2(OH)-CH2(OH) + 2MnO2 + 2KOH

3) CH2=CH-CH3 + H2O CH3-CH(OH)-CH3
CH3-CH(OH)-CH3 (H2SO4 конц, t)-- CH2=CH-CH3 + H2O
CH2=CH-CH3 + HBr  CH3-CH(Br)-CH3
CH3-CH(Br)-CH3 + NaOH(спиртовой) CH2=CH-CH3 + NaBr + H2O

4) CH3-CH3 + Cl2 CH3-CH2Cl + HCl
CH3-CH2Cl + NaOH(спиртовой) CH2=CH2 + NaCl + H2O
CH2=CH2 + H2O CH3-CH2-OH 
CH3-CH2-OH ---(H2SO4 конц,t) --- CH2=CH2 + H2O
CH2=CH2 + H2 CH3-CH3

5) CH3-CH2-CH2-CH2-OH CH3-CH2-CH=CH2 + H2O
CH3-CH2-CH=CH2 + HBr CH3-CH2-CHBr-CH3
CH3-CH2-CHBr-CH3 + NaOH(спиртовой) СH3-CH=CH-CH3 + NaBr + H2O
CH3-CH=CH-CH3 + Br2 CH3-CHBr-CHBr-CH3

1) CaCO3 = CaO + CO2
CaO + 3C = CaC2 + CO
CaC2 + 2H2O --- CH≡CH + Ca(OH)2
CH≡CH + H2 CH2=CH2 
CH2=CH2 + Cl2  CH2Cl-CH2Cl
CH2Cl-CH2Cl +    Zn (t)--- CH2=CH2 + ZnCl2
СH2=CH2 + H2O CH3-CH2-OH

2) CH4 + Br2 CH3Br + HBr
2CH3Br + 2Na CH3-CH3 + 2NaBr
CH3-CH3 CH2=CH2 + H2
CH2=CH2 + H2O CH3-CH2-OH
CH3-CH2-OH (в присутствии H2SO4 конц)--- СH2=CH2 + H2O
3CH2=CH2 + 2KMnO4 + 4H2O 3CH2(OH)-CH2(OH) + 2MnO2 + 2KOH

3) CH2=CH-CH3 + H2O CH3-CH(OH)-CH3
CH3-CH(OH)-CH3 (H2SO4 конц, t)-- CH2=CH-CH3 + H2O
CH2=CH-CH3 + HBr  CH3-CH(Br)-CH3
CH3-CH(Br)-CH3 + NaOH(спиртовой) CH2=CH-CH3 + NaBr + H2O

4) CH3-CH3 + Cl2 CH3-CH2Cl + HCl
CH3-CH2Cl + NaOH(спиртовой) CH2=CH2 + NaCl + H2O
CH2=CH2 + H2O CH3-CH2-OH 
CH3-CH2-OH ---(H2SO4 конц,t) --- CH2=CH2 + H2O
CH2=CH2 + H2 CH3-CH3

5) CH3-CH2-CH2-CH2-OH CH3-CH2-CH=CH2 + H2O
CH3-CH2-CH=CH2 + HBr CH3-CH2-CHBr-CH3
CH3-CH2-CHBr-CH3 + NaOH(спиртовой) СH3-CH=CH-CH3 + NaBr + H2O
CH3-CH=CH-CH3 + Br2 CH3-CHBr-CHBr-CH3