By which of the following reactions can `MIC` (methyl isocyante) be obtained? C H 3 − ⊕ N ≡ ⊖ C + H g O ⟶ B C H 3 − ⊕ N ≡ ⊖ C + O 3 ⟶ C C H 3 − ⊕ N ≡ ⊖ C + S ⟶ D C H 3 − ⊕ N ≡ ⊖ C + D M S O

Answer

To determine how methyl isocyanate (MIC) can be obtained from the given reactions, we need to analyze each reaction step by step.

### Step-by-Step Solution:

1. **Understanding Methyl Isocyanate (MIC)**:
- Methyl isocyanate (MIC) has the formula CH₃N=C=O. It is a toxic compound with a strong odor.

2. **Analyzing the Given Reactions**:
- We have four reactions to consider. We need to identify which of these can yield methyl isocyanate.

3. **Reaction A**:
- \( \text{CH}_3N \equiv \text{C} + \text{HgO} \)
- In this reaction, methyl amine reacts with mercury oxide. This reaction can lead to the formation of isocyanate. Therefore, this reaction can potentially yield methyl isocyanate.

4. **Reaction B**:
- \( \text{CH}_3N \equiv \text{C} + \text{O}_3 \)
- Here, methyl amine reacts with ozone. Ozone can oxidize the compound, but it does not lead to the formation of isocyanate. Thus, this reaction does not yield methyl isocyanate.

5. **Reaction C**:
- \( \text{CH}_3N \equiv \text{C} + \text{S} \)
- In this case, sulfur does not contribute to the formation of isocyanate. Therefore, this reaction also does not yield methyl isocyanate.

6. **Reaction D**:
- \( \text{CH}_3N \equiv \text{C} + \text{DMSO} \)
- Dimethyl sulfoxide (DMSO) can facilitate the formation of isocyanate through a reaction with a suitable precursor. This reaction can yield methyl isocyanate.

### Conclusion:
From the analysis, the reactions that can yield methyl isocyanate are:
- **Reaction A** (with mercury oxide)
- **Reaction D** (with DMSO)

### Final Answer:
Methyl isocyanate can be obtained from reactions A and D.

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