Identify the functional group in each compound on this chemistry worksheet.

Let's go through each compound in the worksheet and identify the functional group by analyzing the structure. We'll circle the functional group (in description, since we can't draw here) and then write its name.

---

1.

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

- The –OH group is attached to a carbon.
- This is an alcohol functional group.
- Answer: Alcohol

✔ Functional Group: Alcohol
→ Circle the –O–H group (the oxygen and hydrogen at the end).

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2.

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

- A carbon double-bonded to oxygen, with the carbonyl carbon also bonded to a hydrogen (and another carbon).
- This is an aldehyde functional group (C=O at the end of the chain).
- Answer: Aldehyde

✔ Functional Group: Aldehyde
→ Circle the C=O group at the end (with H attached to the carbonyl carbon).

---

3.

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

- A carbon double-bonded to oxygen, but this carbonyl is not at the end — it’s between two carbon atoms.
- This is a ketone functional group.
- Answer: Ketone

✔ Functional Group: Ketone
→ Circle the C=O group in the middle.

---

4.

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

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

✔ Functional Group: Ester
→ Circle the –C(=O)–O– portion (the carbonyl and the adjacent oxygen).

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5.

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

- A carbonyl group (C=O) directly attached to a hydroxyl group (–OH).
- This is a carboxylic acid functional group.
- Answer: Carboxylic Acid

✔ Functional Group: Carboxylic Acid
→ Circle the –C(=O)–OH group.

---

6.

```
H₃C - CH₂ - C = O
|
CH₃
```

- A carbonyl group (C=O) attached to two alkyl groups (CH₃ and CH₂CH₃).
- This is a ketone.
- Answer: Ketone

✔ Functional Group: Ketone
→ Circle the C=O group.

---

7.

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

- A nitrogen atom bonded to three hydrogen atoms or carbon atoms; here, it's bonded to two hydrogens and one carbon.
- This is an amine functional group (specifically a primary amine).
- Answer: Amine

✔ Functional Group: Amine
→ Circle the –NH₂ group (the nitrogen with two hydrogens).

---

8.

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

- This is just a simple alkane (ethane): only carbon and hydrogen.
- No heteroatoms (like O, N, halogens), so no functional group present.
- But note: The list includes "Alkyl Halide", etc., but this has no functional group.
- However, if we must pick from the list, none apply.
- But sometimes “alkane” is considered the base, but not a functional group.

✔ Functional Group: None (or Not applicable)
→ There is no functional group in this molecule.

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✔ Final Answers:

1. Alcohol
2. Aldehyde
3. Ketone
4. Ester
5. Carboxylic Acid
6. Ketone
7. Amine
8. None (No functional group)

---

Summary Table:

| # | Structure | Functional Group |
|---|----------|------------------|
| 1 | –OH on carbon | Alcohol |
| 2 | C=O at end | Aldehyde |
| 3 | C=O in middle | Ketone |
| 4 | –COOR | Ester |
| 5 | –COOH | Carboxylic Acid |
| 6 | C=O in middle | Ketone |
| 7 | –NH₂ | Amine |
| 8 | Only C and H | None |

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> 💡 Tip: Remember:
> - Alcohol: –OH
> - Aldehyde: –CHO (C=O at end)
> - Ketone: –C(=O)– (in middle)
> - Carboxylic Acid: –COOH
> - Ester: –COOR
> - Amine: –NH₂ (or –NHR, –NR₂)
> - Alkyl Halide: C–X (X = F, Cl, Br, I)
> - Ether: –O– (between two carbons)

Let me know if you'd like a version with the circles drawn in text!