The number of carbonyl carbon in the products X is
Propyne `underset(Zn//H_2O)overset(O_3//CH_2CL_2,Delta)rarrX`

Answer

To solve the problem, we need to analyze the reaction of propyne with ozone followed by zinc hydrolysis to determine the number of carbonyl carbons in the product X.

### Step-by-Step Solution:

1. **Identify the Structure of Propyne**:
Propyne is an alkyne with the formula \( \text{C}_3\text{H}_4 \). Its structure can be represented as:
\[ \text{CH}_3-\text{C} \equiv \text{C} \]

2. **Ozonolysis Reaction**:
When propyne undergoes ozonolysis, it reacts with ozone (\( \text{O}_3 \)) in a solvent like dichloromethane (\( \text{CH}_2\text{Cl}_2 \)). The triple bond breaks, and an ozonide is formed. The ozonide structure can be represented as:
\[ \text{CH}_3-\text{C}(\text{O})-\text{C}(\text{O})-\text{H} \]
This structure contains a carbonyl (C=O) group.

3. **Zinc Hydrolysis**:
The ozonide is then treated with zinc in the presence of water (\( \text{Zn/H}_2\text{O} \)). During this step, the ozonide will be hydrolyzed, resulting in the cleavage of the ozonide and the formation of carbonyl compounds. The reaction leads to:
\[ \text{CH}_3-\text{C}(\text{O})-\text{H} + \text{H}_2\text{C}=\text{O} \]
This results in two products: acetone and formaldehyde.

4. **Counting Carbonyl Carbons**:
In the final product X, we have:
- One carbonyl carbon from acetone (\( \text{CH}_3-\text{C}(\text{O})-\text{CH}_3 \))
- One carbonyl carbon from formaldehyde (\( \text{H}_2\text{C}=\text{O} \))

Therefore, the total number of carbonyl carbons in product X is:
\[ 2 \]

### Final Answer:
The number of carbonyl carbons in the product X is **2**.

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