The correct order for triple bond energy in `CO, N_2, CN` and `C-=C` is ,

Options

A. ` C -= O gt N-= Ngt C-= N gt C-=C`
B. `N -=N gt C-= O gt C-= Cgt C -=N`
C. `N -=N gt C-= O gtN-= Cgt C -=C`
D. `N -=N gt C-= O gtC= Cgt C -=C`

Explanation

To determine the correct order for triple bond energy in `CO`, `N2`, `CN`, and `C≡C`, we can follow these steps:

### Step 1: Understand the Concept of Bond Energy
Bond energy is the amount of energy required to break a bond between two atoms. Generally, shorter bonds (which occur between smaller atoms) have higher bond energies due to the stronger attraction between the nuclei of the bonded atoms.

### Step 2: Analyze the Molecules
- **`CO` (Carbon Monoxide)**: This molecule has a triple bond between carbon and oxygen. The bond is polar due to the difference in electronegativity between carbon and oxygen.
- **`N2` (Nitrogen Gas)**: This molecule has a triple bond between two nitrogen atoms. Nitrogen atoms are of the same size and have a strong bond due to effective overlap of p-orbitals.
- **`CN` (Cyanide Ion)**: This molecule also has a triple bond, with carbon and nitrogen. The bond is polar, but the electronegativity difference is less than that in `CO`.
- **`C≡C` (Acetylene)**: This molecule has a triple bond between two carbon atoms. Carbon atoms are relatively small, leading to a strong bond.

### Step 3: Compare Bond Energies
1. **`CO`**: The bond energy is high due to the polar nature of the bond and the small size of the atoms involved.
2. **`N2`**: The bond energy is also high due to the effective overlap of p-orbitals, but it is less than that of `CO`.
3. **`CN`**: The bond energy is lower than `CO` and `N2` due to less polarity and the larger size of carbon compared to nitrogen.
4. **`C≡C`**: The bond energy is lower than that of `CO`, `N2`, and `CN` due to the lack of polarity and the fact that both atoms are the same.

### Step 4: Establish the Order
Based on the analysis:
- `CO` has the highest bond energy.
- `N2` follows next.
- `CN` comes after `N2`.
- `C≡C` has the lowest bond energy.

Thus, the correct order for triple bond energy in `CO`, `N2`, `CN`, and `C≡C` is:
**`CO > N2 > CN > C≡C`**

### Final Answer
The correct order for triple bond energy is: **`CO > N2 > CN > C≡C`**

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