Hydrogenation of benzoyl chloride in the presence of `Pd//BaSO_4` gives :

Options

A. benzyl alcohol
B. benzoic acid
C. benzaldehyde
D. toluene

Answer

To solve the question regarding the hydrogenation of benzoyl chloride in the presence of Pd/BaSO4, we can follow these steps:

### Step 1: Understand the Reactants
Benzoyl chloride (C6H5COCl) consists of a benzene ring (C6H5) attached to a carbonyl group (C=O) and a chlorine atom (Cl).

### Step 2: Identify the Catalyst
The catalyst mentioned is Pd/BaSO4, which is known as Lindlar's catalyst. This catalyst is used for the selective hydrogenation of alkynes and can also facilitate the reduction of other functional groups.

### Step 3: Reaction Mechanism
When benzoyl chloride undergoes hydrogenation in the presence of Lindlar's catalyst, the carbonyl group (C=O) is reduced to an aldehyde (C=O becomes C=OH) while the chlorine atom (Cl) is replaced by a hydrogen atom (H).

### Step 4: Write the Product
The product formed from the hydrogenation of benzoyl chloride is benzyldehyde (C6H5CHO) and hydrochloric acid (HCl) as a byproduct.

### Step 5: Evaluate the Options
From the options provided:
1. Benzyl chloride - Incorrect
2. Benzoic acid - Incorrect
3. Benzyldehyde - Correct
4. Toluene - Incorrect

Thus, the correct answer is **benzyldehyde**.

### Final Answer:
The hydrogenation of benzoyl chloride in the presence of Pd/BaSO4 gives **benzyldehyde**.

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