1.

Which of the following used for the conversion of 2-hexyne into trans-2-hexene

Answer»

`H_2//Pd//BaSO_4`
`H_2,PtO_2`
`NaBH_4`
`Li-NH_3//C_2H_5OH`

Solution :The parial REDUCTION of alkynes by active metal in LIQUID AMMONIA takes place through trans vinylic anion which ultimately produces trans alkene.
2-hexyne gives trans-2-hexene on TREATMENT `Li//NH_3 CH_3-CH_2-CH_2-C-=C-CH_3+H_2overset(Li//NH_3)to underset"trans-2-hexene"(CH_3-CH_2-CH_2-overset(H)overset|C-undersetunderset(H)(|)C-CH_3)`


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