Question
Which of the following is used for the conversion of
2 - hexyne into $$trans$$ - 2 - hexene ?
A.
\[{{H}_{2}}/Pd/BaS{{O}_{4}}\]
B.
\[{{H}_{2}},Pt{{O}_{2}}\]
C.
\[NaB{{H}_{4}}\]
D.
\[Li-N{{H}_{3}}/{{C}_{2}}{{H}_{5}}/{{C}_{2}}{{H}_{5}}OH\]
Answer :
\[Li-N{{H}_{3}}/{{C}_{2}}{{H}_{5}}/{{C}_{2}}{{H}_{5}}OH\]
Solution :
$${H_2}/Pd/BaS{O_4}$$ reduces an alkyne to cis - alkene, $${H_2}/Pt$$ reduces it to alkane, $$NaB{H_4}$$ does not reduce an alkyne. Reduction ofan alkyne by active metal in liq. $$N{H_3}$$ gives trans - alkene.