Identify 'Z' in the reaction given below:
`CH_(3)CHO overset(MnO_(4)^(-))underset(dil.H_(2)SO_(4))rarrXoverset(SOCl_(2))rarrYoverset(CH_(3)COONa)rarrZ`

Options

A. `CH_(3)COCH_(2)COONa`
B. `(CH_(3)CO)_(2)O`
C. `CH_(3)CO-O-COCH_(2)CI`
D. `CH_(3)CO-O-COCHCI_(2)`

Answer

To identify 'Z' in the given reaction sequence, we will follow the steps outlined in the question.

### Step 1: Identify the starting compound
The starting compound is acetaldehyde, represented as CH₃CHO.

### Step 2: Reaction with KMnO₄ in dilute H₂SO₄
Acetaldehyde (CH₃CHO) is treated with potassium permanganate (KMnO₄) in the presence of dilute sulfuric acid (H₂SO₄). KMnO₄ is a strong oxidizing agent and will oxidize the aldehyde group (-CHO) to a carboxylic acid group (-COOH).

**Product formed (X):**
- The oxidation of acetaldehyde leads to the formation of acetic acid (CH₃COOH).

### Step 3: Reaction of acetic acid with SOCl₂
Next, acetic acid (X) reacts with thionyl chloride (SOCl₂). This reaction converts the carboxylic acid into an acyl chloride.

**Product formed (Y):**
- The reaction of acetic acid with SOCl₂ produces acetyl chloride (CH₃COCl).

### Step 4: Reaction of acetyl chloride with sodium acetate
Now, acetyl chloride (Y) reacts with sodium acetate (CH₃COONa). In this reaction, the acetate ion (CH₃COO⁻) acts as a nucleophile and attacks the carbonyl carbon of acetyl chloride.

**Product formed (Z):**
- This reaction leads to the formation of acetic anhydride (CH₃CO)₂O.

### Final Answer
Thus, the compound 'Z' formed in the reaction sequence is acetic anhydride, represented as (CH₃CO)₂O.

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