How many sigma and pi bonds are in a molecule of NH2-CH2-CO?

In the molecule NH₂-CH₂-CO, also known as aminoacetaldehyde, we can analyze the types of bonds present.

1. **Analyzing NH₂ (Amine Group)**: The nitrogen (N) atom in the amine group (NH₂) is bonded to two hydrogen (H) atoms with two sigma bonds. Additionally, nitrogen forms a sigma bond with the carbon atom (C) in the rest of the molecule. Thus, from the amine group, we have:

• 2 sigma bonds (N-H)
• 1 sigma bond (N-C)

2. **Analyzing CH₂ (Methylene Group)**: The methylene group (CH₂) has two hydrogen atoms bonded to the carbon atom, each forming a sigma bond. The carbon is also bonded to the next carbonyl carbon (C=O) via another sigma bond. Therefore, from the methylene group, we get:

• 2 sigma bonds (C-H)
• 1 sigma bond (C-C)

3. **Analyzing CO (Carbonyl Group)**: In the carbonyl group (C=O), we have one sigma bond between carbon and oxygen, plus one pi bond resulting from the double bond:

• 1 sigma bond (C=O)
• 1 pi bond (C=O)

Now, let’s sum them up:

• Total Sigma Bonds = 2 (N-H) + 1 (N-C) + 2 (C-H) + 1 (C-C) + 1 (C=O) = 7 sigma bonds
• Total Pi Bonds = 1 (C=O) = 1 pi bond

Therefore, the molecule NH₂-CH₂-CO contains 7 sigma bonds and 1 pi bond.