Assertion (A): When hydrogen and chlorine are placed in sunlight, hydrogen chloride is formed
Reason(R):It is an example of combustion reaction.

Options

A. Both A and R are true, and R is the correct explanation of A
B. Both A and R are true, but R is not the correct explanation of A
C. A is true but R is false.
D. A is false but R is true.

Explanation

To solve the assertion and reason question, we will analyze both the assertion (A) and the reason (R) step by step.

### Step 1: Analyze the Assertion (A)
The assertion states: "When hydrogen and chlorine are placed in sunlight, hydrogen chloride is formed."

- **Explanation**: When hydrogen gas (H₂) and chlorine gas (Cl₂) are exposed to sunlight (or ultraviolet light), they react to form hydrogen chloride (HCl). This reaction is represented by the equation:
\[ H_2(g) + Cl_2(g) \xrightarrow{sunlight} 2HCl(g) \]
- **Conclusion**: The assertion is correct as the reaction does indeed occur under the influence of sunlight.

### Step 2: Analyze the Reason (R)
The reason states: "It is an example of combustion reaction."

- **Explanation**: A combustion reaction typically involves a hydrocarbon reacting with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). For example:
\[ C_xH_y + O_2 \rightarrow CO_2 + H_2O \]
- **Conclusion**: The reaction between hydrogen and chlorine does not fit the definition of a combustion reaction. Instead, it is classified as a photochemical reaction because it requires light (sunlight) to initiate the reaction.

### Step 3: Final Conclusion
- Since the assertion is true (A is correct) and the reason is false (R is incorrect), we can conclude that:
- **Assertion (A)**: True
- **Reason (R)**: False

### Answer
The correct option is that the assertion is true, but the reason is false.

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