Chloroform by reacting with conc. HNO3 produces:

Options

A. Water gas
B. Laughing gas
C. Tear gas
D. Producer gas

Answer

To determine the product formed when chloroform (CHCl3) reacts with concentrated nitric acid (HNO3), we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are chloroform (CHCl3) and concentrated nitric acid (HNO3).

### Step 2: Understand the Reaction Mechanism
Chloroform contains one acidic hydrogen atom (the hydrogen atom attached to carbon). When it reacts with concentrated nitric acid, the acidic hydrogen can be replaced by a nitro group (NO2) from the nitric acid.

### Step 3: Write the Reaction
The reaction can be represented as follows:
\[ \text{CHCl}_3 + \text{HNO}_3 \rightarrow \text{CCl}_3\text{NO}_2 + \text{H}_2\text{O} \]

### Step 4: Identify the Product
The product formed is chloropicrin (CCl3NO2), which is also known as nitrochloroform.

### Step 5: Recognize the Nature of the Product
Chloropicrin is commonly referred to as a tear gas due to its irritating properties.

### Conclusion
Thus, when chloroform reacts with concentrated HNO3, the product formed is chloropicrin (CCl3NO2), which is classified as tear gas.

---