Which of the following is not the name of `CH_(3) NC`?

Options

A. (a) Methyl isocyanide
B. (b) Aceto isonitrile
C. (c) Methyl carbyl amine
D. (d) Acetronitrile

Answer

To determine which of the following is not the name of the compound CH₃NC, we can analyze the options provided based on the structure and nomenclature of the compound.

### Step-by-Step Solution:

1. **Identify the Compound**:
The compound in question is CH₃NC. This structure indicates that we have a methyl group (CH₃) attached to an isocyanide group (NC).

2. **Understand Isocyanides**:
Isocyanides are characterized by the functional group -N≡C, where the nitrogen is bonded to the carbon atom, which is different from cyanides (where the carbon is bonded to the nitrogen, -C≡N).

3. **Analyze the Options**:
We need to evaluate each option to see if it correctly names CH₃NC.

- **Option 1: Methyl isocyanide**:
This is a correct name because it describes the compound accurately, with "methyl" referring to the CH₃ group and "isocyanide" indicating the presence of the isocyanide functional group.

- **Option 2: Aceto isonitrile**:
The term "aceto" typically refers to an acetyl group (CH₃CO-), which is not present in CH₃NC. Therefore, this name is incorrect.

- **Option 3: Methyl carbyl amine**:
This name is also correct as it refers to a type of isocyanide. Carbyl amine is another term used for isocyanides, and since we have a methyl group, it fits.

- **Option 4: Acetonitrile**:
Acetonitrile (CH₃CN) refers to a nitrile, where the carbon is bonded to a nitrogen atom in a different way than in isocyanides. Thus, this name does not apply to CH₃NC.

4. **Conclusion**:
The names that do not correspond to CH₃NC are "Aceto isonitrile" and "Acetonitrile". However, since the question asks for one name that is not correct, we can conclude that **Aceto isonitrile** is the most incorrect option.

### Final Answer:
**Aceto isonitrile** is not the name of CH₃NC.

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