The trans-alkenes are formed by the reduction of alkynes with

1. $\mathrm{Sn}-\mathrm{HCl}$
2. ${\mathrm{H}}_2-\mathrm{Pd}/\mathrm{C},\mathrm{ }{\mathrm{BaSO}}_4$
3. ${\mathrm{NaBH}}_4$
4. $\mathrm{Na}/\mathrm{liq}.{\mathrm{NH}}_3$

Solution

Birch reduction is anti-addition. So trans alkene will be produced.

Asked in: JEE Main 2018 (08 Apr)

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