Question

Reactant $P$ gives product $Q$ or $R$.
The possible reagents are:

(I) $2Na$/liq. $N{H}_3$
(II) $H_2/Pd/CaC{O}_3$ (quinoline)
(III) $2H_2/Pd/C$

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

• A. $Q$ is obtained on treatment with reagent $\left(I\right)$
• B. $R$ and $Q$ are obtained on treatment with reagent $\left(II\right)$
• C. $R$ is obtained on treatment with reagent $\left(I\right)$
• D. $R$ is obtained on treatment with reagent $\left(II\right)$

Answer 1

The correct option is C $R$ is obtained on treatment with reagent $\left(I\right)$

Catalytic hydrogenation $H_2/Pd/C$ of triple bonds forms cis form of the double bonds. Same implies to $H_2/Pd/{CaCO}_3$ (Quinoline). On the other hand, the reduction of alkali metals in liquid ammonia forms trans compounds.

As R is trans product it will be formed by reagent $\text{I}$

Hence, the correct option is $\text{C}$