Triple bond is not present in

Options

A. Cyanogen
B. Propyne
C. Nitrous Oxide
D. Nitrogen dioxide

Explanation

To determine which compound does not contain a triple bond, we will analyze each of the given options systematically.

### Step 1: Identify the compounds
The options provided are:
1. Cyanogen (C₂N₂)
2. Propine (C₃H₄)
3. Nitrous Oxide (N₂O)
4. Nitrogen Dioxide (NO₂)

### Step 2: Analyze Cyanogen
Cyanogen has the formula C₂N₂. Its structure can be represented as:
- C≡N—C≡N
This indicates that there is a triple bond between the carbon and nitrogen atoms. Therefore, cyanogen does have a triple bond.

### Step 3: Analyze Propine
Propine has the formula C₃H₄. The structure can be represented as:
- H—C≡C—C—H
This shows that there is a triple bond between the first two carbon atoms. Thus, propine also contains a triple bond.

### Step 4: Analyze Nitrous Oxide
Nitrous Oxide has the formula N₂O. Its structure can be represented as:
- N≡N—O
This indicates that there is a triple bond between the two nitrogen atoms. Therefore, nitrous oxide also contains a triple bond.

### Step 5: Analyze Nitrogen Dioxide
Nitrogen Dioxide has the formula NO₂. Its structure can be represented as:
- O=N—O
In this case, there is a double bond between nitrogen and one oxygen atom, and a single bond with the other oxygen atom. There are no triple bonds present in nitrogen dioxide.

### Conclusion
After analyzing all options, we find that:
- Cyanogen has a triple bond.
- Propine has a triple bond.
- Nitrous Oxide has a triple bond.
- Nitrogen Dioxide does not have a triple bond.

Thus, the answer to the question "Triple bond is not present in" is **Nitrogen Dioxide (NO₂)**.

### Final Answer:
**Triple bond is not present in Nitrogen Dioxide (NO₂).**

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