Naming Alkenes Worksheet featuring chemical structures of different alkenes.

To solve the problem of naming the alkenes in the provided worksheet, we need to follow the IUPAC (International Union of Pure and Applied Chemistry) nomenclature rules for alkenes. Here's a step-by-step explanation of how to name each compound:

---

General Rules for Naming Alkenes:

1. Identify the parent chain:
- Find the longest continuous carbon chain that contains the double bond.
- The parent chain must include the double bond.

2. Number the carbon atoms:
- Start numbering the carbon atoms from the end that gives the double bond the lowest possible number.
- The position of the double bond is indicated by the number of the first carbon atom involved in the double bond.

3. Name the substituents:
- Identify all substituents attached to the parent chain.
- List them alphabetically in the name.
- Indicate the position of each substituent using the carbon number where it is attached.

4. Indicate the double bond:
- Use the suffix "-ene" to indicate the presence of a double bond.
- Include the position of the double bond as a prefix (e.g., "2-" for a double bond between C-2 and C-3).

5. Check for multiple substituents or branches:
- If there are multiple substituents, list them in alphabetical order.
- If there are multiple identical substituents, use prefixes like "di-", "tri-", etc., and separate their positions with commas.

---

Step-by-Step Solution for Each Compound:

#### 1. First Compound:
```
CH3
|
H3C-C=C-CH3
|
CH3
```
- Parent chain: The longest chain is 3 carbons (propene).
- Double bond: It is between C-1 and C-2.
- Substituents: There are two methyl groups (CH₃) on C-2.
- Name: 2,2-Dimethylpropene

#### 2. Second Compound:
```
CH3
|
H3C-CH=CH-CH3
|
CH3
```
- Parent chain: The longest chain is 4 carbons (butene).
- Double bond: It is between C-2 and C-3.
- Substituents: There are two methyl groups (CH₃) on C-2 and C-3.
- Name: 2,3-Dimethylbut-2-ene

#### 3. Third Compound:
```
CH3
|
H3C-CH-CH=CH2
|
CH3
```
- Parent chain: The longest chain is 4 carbons (butene).
- Double bond: It is between C-3 and C-4.
- Substituents: There are two methyl groups (CH₃) on C-2 and C-3.
- Name: 2,3-Dimethylbut-3-ene

#### 4. Fourth Compound:
```
CH3
|
H3C-CH=C-CH3
|
CH3
```
- Parent chain: The longest chain is 4 carbons (butene).
- Double bond: It is between C-2 and C-3.
- Substituents: There are two methyl groups (CH₃) on C-1 and C-3.
- Name: 1,3-Dimethylbut-2-ene

#### 5. Fifth Compound:
```
CH3
|
H2C=CH-CH-CH3
|
CH3
```
- Parent chain: The longest chain is 4 carbons (butene).
- Double bond: It is between C-1 and C-2.
- Substituents: There are two methyl groups (CH₃) on C-2 and C-4.
- Name: 2,4-Dimethylbut-1-ene

#### 6. Sixth Compound:
```
CH3
|
H3C-CH-CH=CH2
|
CH3
```
- Parent chain: The longest chain is 4 carbons (butene).
- Double bond: It is between C-3 and C-4.
- Substituents: There are two methyl groups (CH₃) on C-2 and C-3.
- Name: 2,3-Dimethylbut-3-ene

#### 7. Seventh Compound:
```
CH3
|
H3C-CH-CH=CH2
|
CH3
```
- Parent chain: The longest chain is 4 carbons (butene).
- Double bond: It is between C-3 and C-4.
- Substituents: There are two methyl groups (CH₃) on C-2 and C-3.
- Name: 2,3-Dimethylbut-3-ene

#### 8. Eighth Compound:
```
CH3
|
H3C-CH-CH=CH2
|
CH3
```
- Parent chain: The longest chain is 4 carbons (butene).
- Double bond: It is between C-3 and C-4.
- Substituents: There are two methyl groups (CH₃) on C-2 and C-3.
- Name: 2,3-Dimethylbut-3-ene

---

Final Answer:

1. 2,2-Dimethylpropene
2. 2,3-Dimethylbut-2-ene
3. 2,3-Dimethylbut-3-ene
4. 1,3-Dimethylbut-2-ene
5. 2,4-Dimethylbut-1-ene
6. 2,3-Dimethylbut-3-ene
7. 2,3-Dimethylbut-3-ene
8. 2,3-Dimethylbut-3-ene

Boxed Final Answer:
\[
\boxed{
\begin{array}{l}
1. \text{2,2-Dimethylpropene} \\
2. \text{2,3-Dimethylbut-2-ene} \\
3. \text{2,3-Dimethylbut-3-ene} \\
4. \text{1,3-Dimethylbut-2-ene} \\
5. \text{2,4-Dimethylbut-1-ene} \\
6. \text{2,3-Dimethylbut-3-ene} \\
7. \text{2,3-Dimethylbut-3-ene} \\
8. \text{2,3-Dimethylbut-3-ene}
\end{array}
}
\]