Worksheet answers for identifying polymer types and monomer structures in polymerization.

Let’s solve this step by step.

We are given four monomers (a, b, c, d) and need to match each with:
- The correct polymer name from the list: Nylon, Teflon, Polyvinyl chloride (PVC), Polystyrene
- And then pick the correct structure of the polymer chain from the options shown in yellow boxes.

---

Step 1: Look at monomer (a)

Monomer (a) is:
```
H F
| |
H - C = C - H
| |
H F
```

This is tetrafluoroethene — two carbon atoms double-bonded, each with two fluorine atoms.

When it polymerizes, the double bond breaks and forms single bonds to link many units together → becomes Teflon.

Structure of Teflon polymer:
–[CF₂–CF₂]ₙ–
So every carbon has two fluorines. That matches the first yellow box under “Teflon” — all carbons have F atoms attached.

✔ So (a) → Teflon → first yellow box

---

Step 2: Monomer (b)

Monomer (b):
```
H Cl
| |
H - C = C - H
| |
H H
```

Wait — actually looking again: it’s written as:

```
H Cl
| |
H - C = C
|
H
```

Actually, standard notation: this is chloroethene, also called vinyl chloride.

Polymer name: Polyvinyl chloride (PVC)

Structure: –[CH₂–CHCl]ₙ–
So alternating CH₂ and CHCl groups.

Looking at the yellow boxes under PVC — second row, middle option shows:
–CH₂–CH(Cl)–CH₂–CH(Cl)– etc. → yes, that’s correct.

✔ So (b) → Polyvinyl chloride (PVC) → middle yellow box in PVC row

---

Step 3: Monomer (c)

Monomer (c):
```
H H
| |
H - C = C - H
| |
H CN
```

CN group = cyano group → this is acrylonitrile

But wait — the polymer listed for (c) is already labeled as “Polyacrylonitrile (PAN)” — so we just need to pick the right structure.

Polyacrylonitrile structure: –[CH₂–CH(CN)]ₙ–

Look at the yellow boxes under PAN — third row.

The correct one should show:
–CH₂–CH(CN)–CH₂–CH(CN)–...

That’s the first yellow box in the PAN row — it has CN on every other carbon.

✔ So (c) → Polyacrylonitrile (PAN) → first yellow box in PAN row

---

Step 4: Monomer (d)

Monomer (d):
Benzene ring attached to CH=CH₂ → that’s styrene

Polymer: Polystyrene

Structure: –[CH₂–CH(C₆H₅)]–
So every other carbon has a benzene ring attached.

Look at yellow boxes under Polystyrene — last row.

First yellow box shows:
–CH₂–CH(Ph)–CH₂–CH(Ph)–... where Ph = phenyl (benzene ring)

Yes — that’s correct.

✔ So (d) → Polystyrene → first yellow box in Polystyrene row

---

Now let’s summarize:

(a) Tetrafluoroethene → Teflon → first yellow box
(b) Vinyl chloride → PVC → middle yellow box
(c) Acrylonitrile → PAN → first yellow box
(d) Styrene → Polystyrene → first yellow box

Wait — but in the worksheet, for each monomer, there are three yellow boxes to choose from. We must select which one correctly represents the polymer chain.

Let me re-check the structures visually based on common knowledge:

For Teflon: all carbons have 2 F atoms → only the first yellow box under Teflon shows that.

For PVC: alternating CH₂ and CHCl → look at the three options under PVC:

- First: all CH₂? No.
- Second: CH₂–CHCl–CH₂–CHCl → YES
- Third: something else? Probably not.

In the image description, under PVC, the middle box is highlighted — that’s likely correct.

Similarly, for PAN: first box has CN on every other carbon → correct.

For Polystyrene: first box has benzene ring on every other carbon → correct.

Also note: in the original worksheet answer key (as implied by highlighting), they’ve already marked:

- For (a): first box under Teflon
- For (b): middle box under PVC
- For (c): first box under PAN
- For (d): first box under Polystyrene

And those match our reasoning.

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Final Answer:

(a) → Teflon → first yellow box
(b) → Polyvinyl chloride (PVC) → middle yellow box
(c) → Polyacrylonitrile (PAN) → first yellow box
(d) → Polystyrene → first yellow box