In the following reaction product 'P' is
`R-overset(O)overset(||)C-Clunderset(BaSO_(4))overset(H_(2))toP`.

Options

A. `RCH_(2)OH`
B. `RCOOH`
C. `RCHO`
D. `RCH_(3)`

Answer

To solve the question regarding the product 'P' formed in the reaction of R-C(=O)Cl with H2 in the presence of BaSO4, we can follow these steps:

### Step 1: Identify the Reactants
The reactant in the reaction is an acid chloride, which can be represented as R-C(=O)Cl. Here, R represents an alkyl or aryl group.

**Hint:** Recognize that acid chlorides are derivatives of carboxylic acids and are reactive due to the presence of the chlorine atom.

### Step 2: Understand the Reaction Conditions
The reaction is carried out in the presence of hydrogen gas (H2) and a catalyst, which is palladium on barium sulfate (Pd/BaSO4). This combination indicates that the reaction is likely a Rosenmund reduction.

**Hint:** The Rosenmund reduction specifically involves the reduction of acid chlorides to aldehydes using hydrogen gas and a palladium catalyst.

### Step 3: Predict the Reaction Outcome
In the Rosenmund reduction, the chlorine atom in the acid chloride (R-C(=O)Cl) is replaced by a hydrogen atom, resulting in the formation of an aldehyde (R-CHO).

**Hint:** Remember that the chlorine atom is replaced by hydrogen during the reduction process, leading to the formation of an aldehyde.

### Step 4: Write the Product
The product 'P' formed from the reaction of R-C(=O)Cl with H2 in the presence of Pd/BaSO4 is R-CHO, which is the general formula for an aldehyde.

**Hint:** Aldehydes have the functional group -CHO, which is characteristic of their structure.

### Step 5: Identify the By-Product
Along with the formation of the aldehyde, hydrogen chloride (HCl) is produced as a by-product of the reaction.

**Hint:** Always consider the by-products formed during chemical reactions, especially when halogens are involved.

### Conclusion
The product 'P' in the given reaction is R-CHO, which is an aldehyde.

### Final Answer
The correct answer is that the product 'P' is an aldehyde, represented as R-CHO.

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