Question

The reduction of 4octyne with $H_2$ in the presence of $Pd/CaC{O}_3$ quinoline gives:

• A. trans-4-octene
• B. cis-4-octene
• C. a mixture of cis and trans-4-octene
• D. a completely reduced product $C_8{H}_{18}$

Answer 1

Answer: (B)

cis-4-octene

The reduction of 4-octyne with $H_2$ in the presence of $Pd/CaC{O}_3$ quinoline gives cis-4-octene. The carbon carbon tripple bond is selectively reduced to C=C double bond. The product is cis alkene.