Question

how will you synthesis:
1)Acetylene from ethylene
2)1-Butyne from Acetylene

Answer 1

1) H₂C=CH₂ + Br₂ --> Br-HC=CH-Br

Br-HC=CH-Br + KOH (in alcohol) --> HC=CH

2) HC=CH+ Na ---> HC=CNa

HC=CNa+ CH₃Cl --> HC=C-CH₃