Question

Consider the following transformations of a compound P.

Choose the correct option(s).
A. P is

B. X is \[Pd - C/quinoline/{H_2}\]
C. P is

D.R is

Answer 1

Hint: \[NaN{H_2}\] is a potent nucleophile and strong base. It is employed in elimination reactions as well as the deprotonation of weak acids. Alkenes can be reduced to alkanes with \[{H_2}\] in the presence of metal catalysts such as \[Pt\] .


Complete Step by Step Solution:
From the options, let us assume the structure of P is as follows:

The reaction of P to R can be written as follows:

Hydrogenation can be written as follows:

From the options, let us take \[Pd - C/quinoline/{H_2}\] as reagent X. \[Pd - C/quinoline/{H_2}\] is Lindlar’s catalyst. The reaction can be written as follows:

Therefore, option A is not the correct answer.
From the options, let us assume the structure of P is as follows:

Let us assume \[Pd - C/quinoline/{H_2}\] as reagent X. The reaction of P to Q can be written as follows:

The hydrogenation reaction can be written as follows:

The reaction from P to R can be written as follows:

Therefore, option B and C are correct answer.

Additional Information:

• • A catalyst is a material that modifies or speeds up any chemical reaction without causing any change on its own. Typically, a catalyst is utilised in smaller quantities than the reactants or other reaction participants.

• A heterogeneous catalyst called Lindlar is made of palladium that was created on calcium carbonate and treated with various forms of lead. A heterogeneous catalyst is one that constantly exists in a distinct state from the reactant solution (solid, liquid, or gas solution).

• After Herbert Lindlar, the company's founder, the name "Lindlar" was given. In some places, lead will be required to deactivate the palladium. Lead is present; hence this is frequently referred to as a "poisoned catalyst." When a catalyst's potency starts to decline, it becomes toxic.

Note: Different chemical pollutants, including lead acetate and lead oxide, are utilised to poison the palladium. Normally, just 5% of the weight of the catalyst is made up of the palladium element. Alkenes are subjected to the catalyst in order to hydrogenate alkynes.