Consider the molecule of nitrosopropane. Its Lewis structure is shown. Н Н THI C C C Н Н Н How many sigma (♂) and how many pi (π) bonds are there in the nitrosopropane molecule? 1 sigma and 11 pi bonds 11 sigma and 1 pi bonds 10 sigma and 1 pi bonds 7 sigma and 4 pi bonds 1 sigma and 10 pi bonds

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**Topic: Bonding in Nitrosopropane Molecule**

Consider the molecule of nitrosopropane. Its Lewis structure is shown below:

![Lewis Structure of Nitrosopropane](#)

In the Lewis structure, the atoms are connected as follows:
- Three carbon atoms (C) are connected in a chain.
- The first carbon (C) is bonded to three hydrogen (H) atoms.
- The second carbon (C) is bonded to two hydrogen (H) atoms.
- The third carbon (C) is bonded to two hydrogen (H) atoms and a nitrogen (N) atom.
- The nitrogen (N) atom is double-bonded to an oxygen (O) atom, which also has two lone pairs of electrons.

**Question:**
How many sigma (σ) and how many pi (π) bonds are there in the nitrosopropane molecule?

**Options:**
- 1 sigma and 11 pi bonds
- 11 sigma and 1 pi bonds
- 10 sigma and 1 pi bonds
- 7 sigma and 4 pi bonds
- 1 sigma and 10 pi bonds

**Explanation:**

A **sigma bond (σ bond)** is a single covalent bond formed by the direct overlap of orbitals from two atoms, which lies along the axis connecting the two nuclei. A **pi bond (π bond)** is formed by the side-by-side overlap of two p orbitals.

For nitrosopropane:
- Each C-H bond is a sigma bond.
- Each C-C bond is a sigma bond.
- The C-N bond is a sigma bond.
- The N=O double bond consists of one sigma bond and one pi bond.

**Solution:**
Count the sigma and pi bonds in the structure:
- C-C-C chain: 2 sigma bonds
- C-H bonds: 8 sigma bonds (3 + 2 + 3)
- C-N bond: 1 sigma bond
- N=O bond: 1 sigma bond and 1 pi bond

Total sigma bonds = 11
Total pi bonds = 1

Correct answer: **11 sigma and 1 pi bonds**.
Transcribed Image Text:**Topic: Bonding in Nitrosopropane Molecule** Consider the molecule of nitrosopropane. Its Lewis structure is shown below: ![Lewis Structure of Nitrosopropane](#) In the Lewis structure, the atoms are connected as follows: - Three carbon atoms (C) are connected in a chain. - The first carbon (C) is bonded to three hydrogen (H) atoms. - The second carbon (C) is bonded to two hydrogen (H) atoms. - The third carbon (C) is bonded to two hydrogen (H) atoms and a nitrogen (N) atom. - The nitrogen (N) atom is double-bonded to an oxygen (O) atom, which also has two lone pairs of electrons. **Question:** How many sigma (σ) and how many pi (π) bonds are there in the nitrosopropane molecule? **Options:** - 1 sigma and 11 pi bonds - 11 sigma and 1 pi bonds - 10 sigma and 1 pi bonds - 7 sigma and 4 pi bonds - 1 sigma and 10 pi bonds **Explanation:** A **sigma bond (σ bond)** is a single covalent bond formed by the direct overlap of orbitals from two atoms, which lies along the axis connecting the two nuclei. A **pi bond (π bond)** is formed by the side-by-side overlap of two p orbitals. For nitrosopropane: - Each C-H bond is a sigma bond. - Each C-C bond is a sigma bond. - The C-N bond is a sigma bond. - The N=O double bond consists of one sigma bond and one pi bond. **Solution:** Count the sigma and pi bonds in the structure: - C-C-C chain: 2 sigma bonds - C-H bonds: 8 sigma bonds (3 + 2 + 3) - C-N bond: 1 sigma bond - N=O bond: 1 sigma bond and 1 pi bond Total sigma bonds = 11 Total pi bonds = 1 Correct answer: **11 sigma and 1 pi bonds**.
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