Methyl alcohol when reacted with carbon monoxide using cobalt or rhodium as catalyst , compound, `'A'` is formed. On heating `'A'` with `HI` in the presence of red phosphorus as catalyst `'B'` is formed. Identify `'B'`.

Options

A. `CH_(3)COOH`
B. `CH_(3)CHO`
C. `CH_(3)CH_(2)I`
D. `CH_(3)CH_(3)`

Explanation

To solve the problem step by step, we will analyze the reactions involved:

### Step 1: Identify the reaction of methyl alcohol with carbon monoxide.
Methyl alcohol (methanol, CH₃OH) reacts with carbon monoxide (CO) in the presence of a catalyst such as cobalt or rhodium. This reaction typically leads to the formation of a carboxylic acid.

**Reaction:**
\[ \text{CH}_3\text{OH} + \text{CO} \xrightarrow{\text{Cobalt/Rhodium}} \text{CH}_3\text{COOH} \]
Here, the product formed is acetic acid (CH₃COOH), which we will label as compound 'A'.

### Step 2: Identify the reaction of compound 'A' (acetic acid) with HI and red phosphorus.
Next, we take the acetic acid (compound 'A') and react it with hydrogen iodide (HI) in the presence of red phosphorus. This reaction is a reduction process where the carboxylic acid is converted into an alkane.

**Reaction:**
\[ \text{CH}_3\text{COOH} + \text{HI} \xrightarrow{\text{Red Phosphorus}} \text{C}_2\text{H}_6 \]
In this case, acetic acid is reduced to ethane (C₂H₆), which we will label as compound 'B'.

### Conclusion:
Thus, the compound 'B' formed from the reaction of acetic acid with HI in the presence of red phosphorus is ethane (C₂H₆).

### Final Answer:
**B = Ethane (C₂H₆)**

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