Помогите с цепочкой

1. C + 2H2 -> CH4

2. CH4 + Br2 -(hv)-> CH3Br + HBr

3. 2CH3Br + 2Na -> CH3-CH3 + 2NaBr

4. CH3-CH3 -(Ni, 500°C)-> CH2=CH2 + H2

5. CH2=CH2 + H2O -(конц. H2SO4)-> C2H5OH

6. CH3Br + CH3-CH2Br + 2Na -> CH3-CH2-CH3 + 2NaBr

7. CH3-CH2-CH3 -(Ni, 500°C)-> CH2=CH-CH3 + H2

8. CH2=CH-CH3 + Br2 -> CH2(Br)-CH(Br)-CH3

9. CH2(Br)-CH(Br)-CH3 + Zn -> CH2=CH-CH3 + ZnBr2

10. CH2=CH-CH3 + HCI -> CH3-CH(CI)-CH3

11. CH3-CH(CI)-CH3 + NaOH -> CH2=CH-CH3 + NaCl + H2O