First slide
Alkynes
Question

Reactant A gives product B or C

The possible reagents are:

(I) 2Na/liq.NH3

 (II) H2/Pd/CaCO3 (quinoline) 

 (III) 2H2/Pd/C

The correct statement with respect to the above conversion is/are:

Difficult
Solution

Reagent (I) gives trans product. Reagents (II) and (III) give cis-product. The reagent I is called as Birch reagent and the intermediate is di anion and it is stable in trans form.

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