Which are related with Curtius rearrangement?

Options

A. `NaN_3`
B. `R - NH_2`
C. `R - overset(overset(O)(||))C - Cl`
D. None of these

Explanation

To solve the question "Which are related with Curtius rearrangement?", we can break down the process step by step:

### Step 1: Understand the Curtius Rearrangement
The Curtius rearrangement is a chemical reaction involving the conversion of acyl azides into isocyanates. It typically starts with an acid chloride and sodium azide (NaN3).

### Step 2: Identify the Reactants
The main reactants in the Curtius rearrangement are:
- Acid chloride (RCOCl)
- Sodium azide (NaN3)

### Step 3: Reaction Mechanism
1. The acid chloride reacts with sodium azide to form an acyl azide.
2. Upon heating, the acyl azide undergoes rearrangement to form an isocyanate (R-N=C=O) and nitrogen gas (N2).
3. The isocyanate can further react with alcohols to form carbamates or can undergo hydrolysis to yield amines (RNH2) and carbon dioxide (CO2).

### Step 4: Identify the Products
From the rearrangement, the following products are formed:
- Isocyanate (R-N=C=O)
- Amine (RNH2)
- By-products like nitrogen gas (N2) and possibly alcohols (if alcohols are present in the reaction).

### Step 5: Conclusion
Based on the above steps, we can conclude that the components related to the Curtius rearrangement include:
- Sodium azide (NaN3)
- Amine (RNH2)
- Acid chloride (RCOCl)

### Final Answer
The substances related to the Curtius rearrangement are:
- NaN3 (Sodium azide)
- RNH2 (Amine)
- RCOCl (Acid chloride)