Identify the functional group in each compound from the worksheet.

Let's go through each compound in the worksheet and identify the functional group by describing what it is, circling it (in text form), and writing its name.

---

1.

```
H H
| |
H - C - C - O - H
| |
H H
```

- The –OH group (hydroxyl) is attached to a carbon.
- This is an alcohol functional group.

✔ Functional Group: Alcohol
🔹 Circle: `–O–H` at the end

---

2.

```
H
|
H - C - C = O
| |
H H
```

- A carbon double-bonded to oxygen (`C=O`) with a hydrogen attached directly to that carbonyl carbon.
- This is an aldehyde.

✔ Functional Group: Aldehyde
🔹 Circle: `C=O` where the carbonyl carbon has a H attached

---

3.

```
H O H
| || |
H - C - C - C - H
| |
H H
```

- A carbon double-bonded to oxygen (`C=O`) between two carbon atoms.
- This is a ketone.

✔ Functional Group: Ketone
🔹 Circle: `C=O` in the middle of the chain

---

4.

```
H O H
| || |
H - C - C - O - C - H
| | |
H H H
```

- A carbonyl group (`C=O`) bonded to an oxygen that is connected to another carbon.
- This is an ester functional group (`–COOR`).

✔ Functional Group: Ester
🔹 Circle: `C=O` and `–O–` together as `–COO–`

---

5.

```
H O
| ||
H - C - C - O - H
|
H
```

- A carbonyl group (`C=O`) bonded to a hydroxyl group (`–OH`).
- This is a carboxylic acid.

✔ Functional Group: Carboxylic Acid
🔹 Circle: `C(=O)–O–H`

---

6.

```
CH₃–CH₂–C=O
|
CH₃
```

- A carbonyl group (`C=O`) bonded to two carbon atoms (not terminal).
- This is a ketone.

✔ Functional Group: Ketone
🔹 Circle: `C=O` in the center

---

7.

```
H H
| |
H - C - C - N - H
| | |
H H H
```

- A nitrogen atom bonded to three hydrogens and a carbon chain.
- This is a amine (specifically a primary amine, but just "amine" is sufficient).

✔ Functional Group: Amine
🔹 Circle: `–NH₂` group

---

8.

```
H H
| |
H - C - C - H
| |
H H
```

- Only carbon and hydrogen; no heteroatoms or multiple bonds.
- This is alkane, but no functional group present.

✔ Functional Group: None (or Alkane if required)
🔹 Circle: Nothing — this is not a functional group

> Note: Functional groups are specific reactive sites like –OH, C=O, etc. This molecule has no functional group.

---

✔ Final Answers:

| Number | Structure | Functional Group |
|--------|-----------|------------------|
| 1 | ![Structure 1] | Alcohol |
| 2 | ![Structure 2] | Aldehyde |
| 3 | ![Structure 3] | Ketone |
| 4 | ![Structure 4] | Ester |
| 5 | ![Structure 5] | Carboxylic Acid |
| 6 | ![Structure 6] | Ketone |
| 7 | ![Structure 7] | Amine |
| 8 | ![Structure 8] | None (or Alkane) |

---

🔍 Summary of Functional Groups:

- Alcohol: –OH attached to carbon
- Aldehyde: –CHO (carbonyl at end)
- Ketone: >C=O (carbonyl in middle)
- Ester: –COOR
- Carboxylic Acid: –COOH
- Amine: –NH₂ or similar
- Alkyl Halide: C–X (X = halogen) → *Not present here*
- Ether: R–O–R' → *Not present here*

---

✔ Answer Key for Worksheet:

1. Alcohol
2. Aldehyde
3. Ketone
4. Ester
5. Carboxylic Acid
6. Ketone
7. Amine
8. None (or Alkane)

Let me know if you'd like a visual version with circled groups!