Which of the following amines is employed to synthesize pheny1 isocyante ?

Options

A. `C_(6)H_(5))_(3)N`
B. `(C_(6)H_(5))NH`
C. `C_(6)H_(5)NH_(2)`
D. Any of these

Explanation

To determine which amine is employed to synthesize phenyl isocyanate, we need to follow these steps:

### Step 1: Identify the structure of phenyl isocyanate
Phenyl isocyanate has the structure C6H5-N=C=O. It is derived from an aromatic amine.

**Hint**: Look for the functional groups present in phenyl isocyanate. It contains an isocyanate (N=C=O) group attached to a phenyl ring.

### Step 2: Understand the reaction mechanism
Phenyl isocyanate is typically synthesized by reacting an aromatic primary amine with phosgene (carbonyl chloride, COCl2). The reaction involves the amine attacking the carbonyl carbon of phosgene.

**Hint**: Recall that primary amines have one hydrogen atom attached to the nitrogen, which is crucial for the reaction to occur.

### Step 3: Identify the type of amine needed
To synthesize phenyl isocyanate, we need a primary amine. In this case, aniline (C6H5-NH2) is a primary aromatic amine, which is suitable for this reaction.

**Hint**: Remember that primary amines have the general formula R-NH2, where R is an alkyl or aryl group.

### Step 4: Write the reaction
The reaction can be represented as follows:
1. Aniline reacts with carbonyl chloride.
2. The nitrogen of aniline attacks the carbonyl carbon, leading to the formation of phenyl isocyanate and the release of HCl.

**Hint**: Pay attention to the stoichiometry of the reaction, as it involves the loss of HCl and the formation of the isocyanate group.

### Step 5: Conclusion
Based on the above steps, the amine employed to synthesize phenyl isocyanate is aniline, which is a primary aromatic amine.

**Final Answer**: Aniline (C6H5-NH2) is the correct amine used to synthesize phenyl isocyanate.