Which of the following statements is correct for the most stable canonical structure of carbon monoxide ?

Options

A. A double bond is there between carbon and oxygen
B. `1 sigma, 1 pi ` and 1 coordinate `pi`- bond between carbon and oxygen
C. There are two lone pair of electrons on each atom
D. `1 sigma and 1 pi` bonds between carbon and oxygen

Answer

To determine the most stable canonical structure of carbon monoxide (CO) and identify the correct statement regarding it, we can follow these steps:

### Step 1: Identify the Valence Electrons
- Carbon has 4 valence electrons.
- Oxygen has 6 valence electrons.

### Step 2: Draw the Lewis Structure
- Start by placing carbon and oxygen together.
- Each atom will share electrons to achieve a complete octet.

### Step 3: Form Bonds
- Carbon and oxygen will form a triple bond:
- This consists of one sigma bond and two pi bonds.
- Additionally, one of the pairs of electrons from oxygen can be considered as a coordinate bond (where oxygen donates a pair of electrons to carbon).

### Step 4: Check the Octet Rule
- In the resulting structure:
- Carbon has 8 electrons (from the triple bond).
- Oxygen also has 8 electrons (from the triple bond and its own lone pairs).
- Both atoms have complete octets, which indicates stability.

### Step 5: Analyze the Statements
- **Statement 1:** A double bond is present between carbon and oxygen. (Incorrect)
- **Statement 2:** There is one sigma bond, one pi bond, and one coordinate bond between carbon and oxygen. (Correct)
- **Statement 3:** There are two lone pairs of electrons on each atom. (Incorrect)
- **Statement 4:** There is one sigma bond and one pi bond between carbon and oxygen. (Incorrect)

### Conclusion
The correct statement regarding the most stable canonical structure of carbon monoxide is that there is one sigma bond, one pi bond, and one coordinate bond between carbon and oxygen.

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