Assertion : Ethene can be catalytically hydrogenated.
Reason : Ethene contains all C-H bonds.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states that "Ethene can be catalytically hydrogenated."

- Ethene (C₂H₄) is an alkene that contains a carbon-carbon double bond (C=C).
- Catalytic hydrogenation is a reaction where hydrogen (H₂) is added across the double bond in the presence of a catalyst (such as palladium, platinum, or nickel).
- When ethene undergoes catalytic hydrogenation, the double bond is converted into a single bond, resulting in ethane (C₂H₆).

**Conclusion for Step 1:** The assertion is correct because ethene can indeed be hydrogenated.

### Step 2: Analyze the Reason
The reason states that "Ethene contains all C-H bonds."

- Ethene has the molecular formula C₂H₄, which means it has two carbon atoms and four hydrogen atoms.
- However, it contains a double bond between the carbon atoms (C=C), which means not all bonds in ethene are C-H bonds. The double bond is a C=C bond, not a C-H bond.

**Conclusion for Step 2:** The reason is incorrect because ethene does not contain only C-H bonds; it also contains a C=C double bond.

### Step 3: Final Conclusion
Based on the analysis:
- The assertion is true: Ethene can be catalytically hydrogenated.
- The reason is false: Ethene does not contain all C-H bonds.

Thus, the correct answer to the question is that the assertion is true but the reason is false.

### Final Answer:
The correct option would be C (Assertion is true, Reason is false).

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