Assertion : Acetylene on reacting with sodamide gives sodium
acetylide and ammonia.
Reason : sp hybridised carbon atoms of acetylene are considerably electronegative .

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 reasonb 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-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that acetylene reacts with sodamide to produce sodium acetylide and ammonia.
- Acetylene (C₂H₂) has a triple bond between the two carbon atoms, which makes one of its hydrogen atoms acidic.

2. **Reaction Mechanism**:
- When sodamide (NaNH₂), a strong base, reacts with acetylene, it abstracts the acidic hydrogen from acetylene.
- The reaction can be represented as:
\[ \text{HC≡CH} + \text{NaNH}_2 \rightarrow \text{HC≡C}^- \text{Na}^+ + \text{NH}_3 \]
- This results in the formation of sodium acetylide (HC≡C⁻Na⁺) and ammonia (NH₃).

3. **Understanding the Reason**:
- The reason states that the sp hybridized carbon atoms of acetylene are considerably electronegative.
- In acetylene, the carbon atoms are sp hybridized, which means they have 50% s character and 50% p character. The higher the s character, the more electronegative the atom is.

4. **Electronegativity of sp Hybridized Carbons**:
- The sp hybridization leads to a greater electronegativity compared to sp² or sp³ hybridized carbons due to the increased s character.
- This increased electronegativity contributes to the polarity of the C-H bond in acetylene, making the hydrogen atom more acidic.

5. **Conclusion**:
- Both the assertion and the reason are correct.
- The reason correctly explains why the assertion is true, as the sp hybridized carbon atoms being electronegative allows for the proton abstraction by the strong base sodamide.

### Final Answer:
Both the assertion and the reason are correct, and the reason is the correct explanation for the assertion.

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