Functional Groups Worksheet displaying molecular structures, functional group names, and their properties.

Let’s go step by step to solve this worksheet.

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We are given a table with three rows. Each row has:

1. A box showing the name or structure of a functional group (some are drawn as ball-and-stick models, some as chemical formulas).
2. A blank column for properties imparted to molecule — we need to fill this in.
3. A column with a larger molecule that contains multiple functional groups — we must circle only the one that matches the first column.

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Row 1:

Functional Group Shown: —SH
This is the sulfhydryl group (also called thiol group).

→ Properties imparted: It can form weak bonds (like disulfide bridges) that help stabilize protein structures. It’s polar and can participate in hydrogen bonding.

→ Circle in the molecule: Look at the right-side structure:

```
O=C-OH
|
H - C - CH₂-SH
|
N-H
|
H
```

The —SH group is clearly shown on the right side attached to CH₂. So circle CH₂—SH.

---

Row 2:

Functional Group Shown:
```
O
||
—O—P—O⁻
|
O⁻
```
This is the phosphate group.

→ Properties imparted: It’s negatively charged, so it makes molecules more soluble in water. It’s key in energy transfer (like ATP) and forms the backbone of DNA/RNA.

→ Circle in the molecule: Right-side structure:

```
OH OH H O
| | | ||
H-C-C-C-O-P-O⁻
| | | |
H H H O⁻
```

The phosphate group is on the far right: O—P(=O)(O⁻)—O⁻. Circle that entire phosphate part.

---

Row 3:

Functional Group Shown:
```
H
|
—C—H
|
H
```
This is a methyl group (—CH₃).

→ Properties imparted: It’s nonpolar and hydrophobic. It doesn’t react much but can affect how molecules fit together (like in DNA methylation or hormone activity).

→ Circle in the molecule: Right-side structure:

```
NH₂
|
C
/ \
N C—CH₃
/ \
O=C C—H
\ /
N—H
```

Look for —CH₃. It’s attached to the ring on the right side. Circle CH₃.

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Now, let’s write the final answers clearly for each row.

Final Answer:
Row 1: Name = Sulfhydryl; Properties = Forms disulfide bonds, polar; Circle = CH₂—SH
Row 2: Name = Phosphate; Properties = Negatively charged, increases solubility, involved in energy transfer; Circle = O—P(=O)(O⁻)—O⁻ group
Row 3: Name = Methyl; Properties = Nonpolar, hydrophobic, affects molecular shape/function; Circle = CH₃