`C_(6)H_(5) "COCl" underset(H_(2))overset(Pd-BaSO_(4))(rarr)` Intermediate
`overset(" Oxidation ")(rarr)` Intermediate`underset("Dry distillation")overset("Ca-Salt")(rarr)` A
Compound (A) in above reaction sequence is –

Options

A. Benzophenone
B. Benzaldehyde
C. Acetophenone
D. Benzoquinone

Answer

To solve the given reaction pathway, we will break it down step by step.

### Step 1: Identify the starting compound
The starting compound is Benzoyl Chloride, which is represented as \( C_6H_5COCl \).

### Step 2: Perform the Rosenmund Reaction
Benzoyl Chloride reacts with hydrogen in the presence of palladium on barium sulfate (Pd-BaSO4). This reaction is known as the Rosenmund reaction, which reduces the acyl chloride to an aldehyde.

**Intermediate formed:**
- The product of this reaction is Benzaldehyde (\( C_6H_5CHO \)).

### Step 3: Oxidation of Benzaldehyde
Next, we take the intermediate Benzaldehyde and oxidize it. Aldehydes can be oxidized to carboxylic acids.

**Intermediate formed:**
- The oxidation of Benzaldehyde results in the formation of Benzoic Acid (\( C_6H_5COOH \)).

### Step 4: Reaction with Calcium Salt
Now, we react Benzoic Acid with a calcium salt (for example, Calcium Hydroxide). In this reaction, the carboxylic acid groups will react with calcium, forming a calcium salt of the acid.

**Intermediate formed:**
- This results in a compound that can be represented as Calcium Benzoate.

### Step 5: Dry Distillation
Finally, we perform dry distillation on the calcium salt. During this process, calcium carbonate (CaCO3) is released, and the remaining components will lead to the formation of a new compound.

**Final product (Compound A):**
- The product of this reaction is Benzophenone (\( C_6H_5COC_6H_5 \)), which consists of two phenyl groups connected by a carbonyl group.

### Conclusion
The compound (A) in the above reaction sequence is **Benzophenone**.

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