Maximum number of molecules of `CH_(3)I` that can react with a molecule of `CH_(3)NH_(2)` are

Options

A. 3
B. 4
C. 2
D. 1

Explanation

To determine the maximum number of molecules of CH₃I that can react with a molecule of CH₃NH₂, we will analyze the reaction step by step.

### Step 1: Identify the Reactants
We have two reactants:
- **CH₃NH₂** (Methylamine) which contains a nitrogen atom with a lone pair of electrons.
- **CH₃I** (Methyl iodide) which has iodine as a leaving group.

### Step 2: First Reaction
The lone pair of electrons on the nitrogen atom in CH₃NH₂ can attack the carbon atom in CH₃I. This results in the formation of a new bond between nitrogen and carbon, and the iodine atom leaves as I⁻.

**Reaction:**
\[ \text{CH}_3\text{NH}_2 + \text{CH}_3\text{I} \rightarrow \text{CH}_3\text{N}^+\text{(CH}_3)\text{H} + \text{I}^- \]

### Step 3: Second Reaction
The newly formed CH₃N⁺(CH₃)H still has a lone pair of electrons on nitrogen. It can react with another molecule of CH₃I in the same manner as before.

**Reaction:**
\[ \text{CH}_3\text{N}^+\text{(CH}_3)\text{H} + \text{CH}_3\text{I} \rightarrow \text{CH}_3\text{N}^{2+}\text{(CH}_3)_2\text{H} + \text{I}^- \]

### Step 4: Third Reaction
The nitrogen atom now has two methyl groups attached and still has a lone pair. It can react with a third molecule of CH₃I.

**Reaction:**
\[ \text{CH}_3\text{N}^{2+}\text{(CH}_3)_2\text{H} + \text{CH}_3\text{I} \rightarrow \text{CH}_3\text{N}^{3+}\text{(CH}_3)_3\text{H} + \text{I}^- \]

### Step 5: Conclusion
After three reactions, we can see that the nitrogen atom can form bonds with three methyl groups from three different CH₃I molecules. Therefore, the maximum number of CH₃I molecules that can react with one molecule of CH₃NH₂ is **3**.

### Final Answer
The maximum number of molecules of CH₃I that can react with a molecule of CH₃NH₂ is **3**.

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