Allyl isocyanide has

Options

A. 9 sigma bonds and 4 pi bonds
B. 8 sigma bonds and 5 pi bonds
C. 8 sigma bonds, 3 pi bonds and 4 non-bonding electrons
D. 9 sigma bonds, 3 pi bonds and 2 non-bonding electrons.

Explanation

To determine the bonding structure of allyl isocyanide, we need to analyze its molecular structure and count the types of bonds present.

### Step-by-Step Solution:

1. **Identify the Structure**:
- Allyl isocyanide has the formula CH2=CH-CH2-N≡C.
- This indicates that there is a carbon-carbon double bond and a carbon-nitrogen triple bond.

2. **Draw the Structure**:
- Start with the allyl part: CH2=CH-CH2.
- Attach the isocyanide part: -N≡C.

3. **Count Sigma Bonds**:
- Sigma bonds are formed by the head-on overlap of atomic orbitals.
- In the structure:
- The C=C double bond has 1 sigma bond.
- Each C-H bond contributes 1 sigma bond (there are 5 C-H bonds).
- The C-N triple bond has 1 sigma bond.
- Total sigma bonds = 1 (C=C) + 5 (C-H) + 1 (C-N) = 7 sigma bonds.

4. **Count Pi Bonds**:
- Pi bonds are formed by the side-to-side overlap of p orbitals.
- In the structure:
- The C=C double bond has 1 pi bond.
- The C-N triple bond has 2 pi bonds.
- Total pi bonds = 1 (C=C) + 2 (C-N) = 3 pi bonds.

5. **Count Non-bonding Electrons**:
- The nitrogen atom in isocyanide has a lone pair of electrons.
- This lone pair contributes 2 non-bonding electrons.

6. **Summarize the Counts**:
- Total sigma bonds: 7
- Total pi bonds: 3
- Total non-bonding electrons: 2

7. **Conclusion**:
- Allyl isocyanide has 7 sigma bonds, 3 pi bonds, and 2 non-bonding electrons.

### Final Answer:
Allyl isocyanide has 7 sigma bonds, 3 pi bonds, and 2 non-bonding electrons.

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