Which of the following reactions does not show the acidic nature of ethyne?

Options

A. Acetylene reacts with sodamide to form sodium acetylides.
B. When passed through ammoniacal cuprous chloride solution, a red precipitate is formed
C. Acetylene reacts with chloine in the dark to form di or tetrachlorides.
D. Acetylene when passed throguh ammoniacal silver nitrate gives a white precipitate

Explanation

To determine which reaction does not demonstrate the acidic nature of ethyne (acetylene), we will analyze each option provided in the question step by step.

### Step 1: Analyze Option A
**Reaction:** Acetylene reacts with sodamide (NaNH2) to form sodium acetylide.

- **Explanation:** In this reaction, sodamide acts as a strong base and extracts a hydrogen atom from the terminal carbon of acetylene. The removal of this hydrogen indicates that the hydrogen is acidic. Therefore, this reaction demonstrates the acidic nature of ethyne.

### Step 2: Analyze Option B
**Reaction:** Acetylene reacts with ammoniacal cuprous chloride solution to form a red precipitate.

- **Explanation:** In this case, the copper (Cu) from the ammoniacal solution can eliminate the acidic hydrogen from acetylene, leading to the formation of a copper acetylide derivative. The formation of this derivative, which is red in color, indicates that the hydrogen is acidic. Thus, this reaction also shows the acidic nature of ethyne.

### Step 3: Analyze Option C
**Reaction:** Acetylene reacts with chlorine in the dark to form dichloride or tetrachloride.

- **Explanation:** This reaction involves the addition of chlorine to acetylene, resulting in the formation of chlorinated products (dichloride or tetrachloride). There is no hydrogen being removed or any indication of acidity in this reaction. Therefore, this reaction does not demonstrate the acidic nature of ethyne.

### Step 4: Analyze Option D
**Reaction:** Acetylene reacts with ammoniacal silver nitrate to form a white precipitate.

- **Explanation:** In this reaction, silver ions can replace the acidic hydrogen from acetylene, forming a silver acetylide derivative. The formation of this derivative, which is a white precipitate, indicates that the hydrogen is indeed acidic. Hence, this reaction shows the acidic nature of ethyne.

### Conclusion
After analyzing all the options, we find that **Option C** (the reaction of acetylene with chlorine) does not show the acidic nature of ethyne.

### Final Answer
**Option C** does not show the acidic nature of ethyne.

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