Certain organic compound on combustion produces three gaseous oxides A, B and C. A and C turned lime water milky, B turned anhydrous `CuSO_(4)` blue and C truned `K_(2)Cr_(2)O_(7)` solution green. The elements present in organic compounds are

Options

A. C, N, O
B. C, H, S
C. C, H only
D. C, S only

Answer

To solve the problem, we need to analyze the information given about the three gaseous oxides produced during the combustion of an organic compound. Let's break down the information step by step.

### Step 1: Identify the properties of the gaseous oxides A, B, and C.

- **Oxide A**: Turns lime water milky.
- **Oxide B**: Turns anhydrous CuSO₄ blue.
- **Oxide C**: Turns K₂Cr₂O₇ solution green.

### Step 2: Analyze the reactions involved.

1. **Oxide A**: The fact that it turns lime water milky indicates that it is likely carbon dioxide (CO₂). The reaction is:
\[ \text{CO}_2 + \text{Ca(OH)}_2 \rightarrow \text{CaCO}_3 \text{ (precipitate)} + \text{H}_2\text{O} \]
Calcium carbonate (CaCO₃) is formed, which is insoluble and causes the milky appearance.

2. **Oxide B**: The blue color change of anhydrous copper sulfate (CuSO₄) indicates the presence of water vapor (H₂O). The reaction is:
\[ \text{CuSO}_4 + 5\text{H}_2\text{O} \rightarrow \text{CuSO}_4 \cdot 5\text{H}_2\text{O} \text{ (blue)} \]
The formation of hydrated copper sulfate (blue) confirms that B is water vapor.

3. **Oxide C**: The green color change of potassium dichromate (K₂Cr₂O₇) indicates the presence of sulfur dioxide (SO₂). The reaction is:
\[ \text{SO}_2 + \text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 \rightarrow \text{Cr}_2(SO_4)_3 + \text{K}_2\text{SO}_4 + \text{H}_2\text{O} \]
The chromium sulfate formed is green, indicating that C is sulfur dioxide.

### Step 3: Conclusion on the elements present in the organic compound.

From the analysis, we have identified:
- A = Carbon dioxide (CO₂)
- B = Water vapor (H₂O)
- C = Sulfur dioxide (SO₂)

Thus, the elements present in the organic compound are carbon (C), hydrogen (H), and sulfur (S).

### Final Answer:
The elements present in the organic compound are **carbon, hydrogen, and sulfur**.

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