Functional Group ID Worksheet with structures of organic molecules for identifying and naming functional groups.

Let's go through each of the 15 organic compounds in the worksheet and identify, circle, and name the functional groups present. I'll explain each one step by step.

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Functional Group Identification

#### 1.
```
H O H
| | |
H-C-C-C-H
| |
H H
```
- Structure: A three-carbon chain with an oxygen atom between the middle and end carbon.
- The central carbon is bonded to two carbons and one oxygen (–O–), and the terminal carbon has an OH group.
- This is ethanol, but actually, it’s a primary alcohol.
- Functional group: Alcohol (–OH)
- ✔ Circle the –OH group on the rightmost carbon.
- Name: Alcohol

---

#### 2.
```
H H
| |
H-C-C-N-H
| |
H H
```
- Nitrogen attached to carbon and hydrogen.
- This is a amine group: nitrogen bonded to two hydrogens and one carbon → primary amine
- Functional group: Amine (specifically primary amine, –NH₂)
- ✔ Circle the N–H₂ group
- Name: Amine

---

#### 3.
```
H O
| ||
H-C-C-O-H
|
H
```
- Central carbon double-bonded to O, single-bonded to OH.
- This is a carboxylic acid.
- Functional group: Carboxylic acid (–COOH)
- ✔ Circle the C=O and –OH together
- Name: Carboxylic acid

---

#### 4.
```
H H
| |
H-C-C-O-H
| |
H H
```
- Terminal carbon with –OH group.
- This is ethanol, a primary alcohol.
- Functional group: Alcohol (–OH)
- ✔ Circle the –OH
- Name: Alcohol

---

#### 5.
```
H
|
C=O
|
H
```
- Carbon double-bonded to oxygen, bonded to two H atoms.
- This is formaldehyde.
- Functional group: Aldehyde (–CHO)
- ✔ Circle the C=O at the end of the chain
- Name: Aldehyde

---

#### 6.
```
H
|
C=O
|
H
```
- Same as #5: formaldehyde.
- Functional group: Aldehyde
- ✔ Circle the C=O
- Name: Aldehyde

> Note: #5 and #6 are identical structures — both are aldehydes.

---

#### 7.
```
O
║
/ \
/ \
/ \
/ \
```
- Cyclohexanone: six-membered ring with a C=O double bond.
- Functional group: Ketone
- ✔ Circle the C=O inside the ring
- Name: Ketone

---

#### 8.
```
H S H
| | |
H-C-C-C-H
| | |
H H H
```
- Sulfur bonded to two carbon atoms.
- This is a thioether or sulfide (R–S–R').
- Functional group: Thioether (or sulfide)
- ✔ Circle the S atom and its bonds
- Name: Thioether

---

#### 9.
```
H H O
| | ||
N-C-C-O-H
| | |
H H H
```
- Nitrogen bonded to two H and one C.
- Carbon adjacent to carbonyl (C=O) and OH → carboxylic acid.
- So this is an amino acid.
- Two functional groups:
- Amino group (–NH₂)
- Carboxylic acid (–COOH)
- ✔ Circle both –NH₂ and –COOH
- Names: Amine and Carboxylic acid

---

#### 10.
```
H O H
| | |
H-C-C-C-S-H
| | | |
H H H H
```
- Terminal sulfur bonded to H → thiol (–SH)
- Also has an alcohol (–OH) group.
- Functional groups:
- Alcohol (–OH)
- Thiol (–SH)
- ✔ Circle both –OH and –SH
- Names: Alcohol and Thiol

---

#### 11.
```
H H O
| | ||
H-C-C-C-H
| | |
H H H
```
- Terminal carbon with C=O and H → aldehyde
- Functional group: Aldehyde
- ✔ Circle the C=O at the end
- Name: Aldehyde

---

#### 12.
```
O
║
/ \
/ \
/ \
```
- Five-membered ring with a carboxylic acid group (–COOH) attached.
- Functional group: Carboxylic acid
- ✔ Circle the –COOH group
- Name: Carboxylic acid

---

#### 13.
```
O
║
/ \
/ \
/ \
```
- Five-membered ring with aldehyde group (–CHO)
- Functional group: Aldehyde
- ✔ Circle the C=O at the end
- Name: Aldehyde

---

#### 14.
```
H
|
H-C-O-H
| |
H-C-C-N-H
| | |
H H H
```
- Carbon with –OH → alcohol
- Nitrogen bonded to two H and one C → amine
- Functional groups:
- Alcohol (–OH)
- Amine (–NH₂)
- ✔ Circle both –OH and –NH₂
- Names: Alcohol and Amine

---

#### 15.
```
O-H
|
/ \
/ \
/ \
```
- Six-membered ring with –OH group.
- This is cyclohexanol.
- Functional group: Alcohol
- ✔ Circle the –OH
- Name: Alcohol

---

✔ Summary Table:

| # | Structure | Functional Group(s) | Name(s) |
|---|----------|---------------------|---------|
| 1 | H₃C–CH(OH)–CH₃ | Alcohol | Alcohol |
| 2 | CH₃–CH₂–NH₂ | Amine | Amine |
| 3 | CH₃–COOH | Carboxylic acid | Carboxylic acid |
| 4 | CH₃–CH₂–OH | Alcohol | Alcohol |
| 5 | H–C=O | Aldehyde | Aldehyde |
| 6 | H–C=O | Aldehyde | Aldehyde |
| 7 | Cyclohexanone | Ketone | Ketone |
| 8 | CH₃–CH₂–S–CH₃ | Thioether | Thioether |
| 9 | H₂N–CH₂–COOH | Amine, Carboxylic acid | Amine, Carboxylic acid |
|10 | HO–CH₂–CH₂–SH | Alcohol, Thiol | Alcohol, Thiol |
|11 | CH₃–CH₂–CHO | Aldehyde | Aldehyde |
|12 | Cyclopentane–COOH | Carboxylic acid | Carboxylic acid |
|13 | Cyclopentane–CHO | Aldehyde | Aldehyde |
|14 | HO–CH₂–CH₂–NH₂ | Alcohol, Amine | Alcohol, Amine |
|15 | Cyclohexanol | Alcohol | Alcohol |

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🔍 Instructions for Worksheet Completion:

- For each compound, circle the functional group(s).
- Write the name of the functional group next to it.
- If multiple groups exist, identify all.

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✔ Final Answer:
You should now be able to complete the worksheet by circling the correct parts and labeling them accordingly based on the above analysis.

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