Which of the following undergoes mustard oil reaction ?

Options

A. Primary amines
B. Secondary amines
C. Tertiary amines
D. All of the above

Explanation

To determine which of the following compounds undergoes the mustard oil reaction, we need to understand the conditions and reactants involved in this reaction. The mustard oil reaction primarily involves the reaction of primary amines with carbon disulfide (CS2) to form alkyl isothiocyanates, which are characterized by their mustard-like smell.

### Step-by-Step Solution:

1. **Identify the Reactants**: The mustard oil reaction involves primary amines and carbon disulfide (CS2).

2. **Understand the Reaction Mechanism**:
- When a primary amine (R-NH2) reacts with carbon disulfide (CS2), it forms an intermediate compound known as alkyl diothiocarbonic acid (R-NH-CS2).
- This intermediate then reacts with mercuric chloride (HgCl2) to yield alkyl isothiocyanate (R-N=C=S), which has a characteristic mustard smell.

3. **Analyze the Options**:
- Check each option provided in the question to identify whether they are primary amines, secondary amines, or tertiary amines.
- Primary amines are the only ones that can undergo the mustard oil reaction due to the presence of two active hydrogen atoms.

4. **Conclusion**:
- Based on the reaction mechanism, only primary amines can undergo the mustard oil reaction. Therefore, the correct answer is the option that lists a primary amine.