Which of the following gives propyne on hydrolysis?

Options

A. `Al_(4)C_(3)`
B. `Mg_(2)C_(3)`
C. `B_(4)C_(3)`
D. `La_(4)C_(3)`

Explanation

To determine which compound gives propyne upon hydrolysis, we need to analyze the options provided. Here’s a step-by-step solution:

### Step 1: Identify the Compounds
First, we need to identify the compounds given in the question. The question mentions "Mg2C3," which is magnesium carbide.

### Step 2: Understand Hydrolysis of Magnesium Carbide
Magnesium carbide (Mg2C3) is known to undergo hydrolysis. Hydrolysis is a chemical reaction involving water, where a compound reacts with water to produce other compounds.

### Step 3: Write the Hydrolysis Reaction
The hydrolysis of magnesium carbide can be represented by the following reaction:

\[ \text{Mg}_2\text{C}_3 + 4 \text{H}_2\text{O} \rightarrow 3 \text{C}_3\text{H}_4 + 2 \text{Mg(OH)}_2 \]

In this reaction, magnesium carbide reacts with water to produce propyne (C3H4) and magnesium hydroxide.

### Step 4: Identify the Product
From the reaction, we can see that one of the products formed is propyne (C3H4), which is the alkyne we are looking for.

### Conclusion
Thus, the compound that gives propyne upon hydrolysis is magnesium carbide (Mg2C3).

### Final Answer
**Magnesium carbide (Mg2C3) gives propyne on hydrolysis.**

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