Which one of the following pairs of species have the same bond order?

Options

A. `CO,NO`
B. `O_2 ,NO^(+)`
C. `CN^(-) ,CO`
D. `N_(2),O_(2)^(-)`

Explanation

To determine which pair of species has the same bond order, we need to calculate the total number of electrons in each species and then use that information to find the bond order. Here’s a step-by-step breakdown:

### Step 1: Identify the pairs of species
The question provides several pairs of species. We will analyze each pair to find their total number of electrons.

### Step 2: Calculate the total number of electrons for each species in the first pair (CO and NO)
- **CO (Carbon Monoxide)**:
- Carbon (C) has 6 electrons.
- Oxygen (O) has 8 electrons.
- Total electrons in CO = 6 + 8 = 14 electrons.

- **NO (Nitric Oxide)**:
- Nitrogen (N) has 7 electrons.
- Oxygen (O) has 8 electrons.
- Total electrons in NO = 7 + 8 = 15 electrons.

**Conclusion for the first pair**: CO and NO do not have the same number of electrons.

### Step 3: Calculate the total number of electrons for the second pair (O2 and NO+)
- **O2 (Oxygen)**:
- Each oxygen atom has 8 electrons.
- Total electrons in O2 = 8 + 8 = 16 electrons.

- **NO+ (Nitric Oxide cation)**:
- Nitrogen (N) has 7 electrons.
- Oxygen (O) has 8 electrons.
- Since it is a cation (NO+), we remove 1 electron.
- Total electrons in NO+ = 7 + 8 - 1 = 14 electrons.

**Conclusion for the second pair**: O2 and NO+ do not have the same number of electrons.

### Step 4: Calculate the total number of electrons for the third pair (CN- and CO)
- **CN- (Cyanide anion)**:
- Carbon (C) has 6 electrons.
- Nitrogen (N) has 7 electrons.
- Since it is an anion (CN-), we add 1 electron.
- Total electrons in CN- = 6 + 7 + 1 = 14 electrons.

- **CO (Carbon Monoxide)**:
- As calculated earlier, CO has 14 electrons.

**Conclusion for the third pair**: CN- and CO have the same number of electrons.

### Step 5: Calculate the total number of electrons for the fourth pair (N2 and O2-)
- **N2 (Nitrogen)**:
- Each nitrogen atom has 7 electrons.
- Total electrons in N2 = 7 + 7 = 14 electrons.

- **O2- (Oxygen anion)**:
- Each oxygen atom has 8 electrons.
- Since it is an anion (O2-), we add 1 electron.
- Total electrons in O2- = 8 + 8 + 1 = 17 electrons.

**Conclusion for the fourth pair**: N2 and O2- do not have the same number of electrons.

### Final Conclusion
The only pair of species that has the same bond order is **CN- and CO**.

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