Naming Alkanes Worksheet with Structural Diagrams and Names

The image you uploaded appears to be a worksheet titled "Naming Alkanes," which involves naming organic compounds based on their structure. The task seems to involve identifying and naming alkanes (hydrocarbons with single bonds) using IUPAC nomenclature rules. Below is an explanation of the solution for each part of the problem:

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Worksheet: Naming Alkanes

#### 1. Identify the parent chain
- Rule: The parent chain is the longest continuous carbon chain in the molecule.
- Steps:
1. Locate the longest carbon chain.
2. Name the parent chain based on the number of carbons:
- 1 carbon: methane
- 2 carbons: ethane
- 3 carbons: propane
- 4 carbons: butane
- 5 carbons: pentane
- 6 carbons: hexane
- 7 carbons: heptane
- 8 carbons: octane
- 9 carbons: nonane
- 10 carbons: decane

#### 2. Number the carbon atoms
- Rule: Number the carbon atoms in the parent chain so that the substituents have the lowest possible numbers.
- Steps:
1. Assign numbers to the carbon atoms in the parent chain, starting from one end.
2. Choose the numbering that gives the substituents the smallest possible locants.

#### 3. Identify and name the substituents
- Rule: Substituents are groups attached to the parent chain.
- Steps:
1. Identify all substituents.
2. Name each substituent according to its structure:
- Methyl: -CH₃
- Ethyl: -C₂H₅
- Propyl: -C₃H₇
- Butyl: -C₄H₉
- Pentyl: -C₅H₁₁
3. Prefix the substituent names with their position on the parent chain.

#### 4. Write the complete name
- Rule: Combine the substituent names with the parent chain name.
- Format:
- List substituents in alphabetical order.
- Use commas to separate multiple substituents.
- Use hyphens to connect the locant and the substituent name.

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Solutions for Each Problem

#### Problem 1:
- Structure: A straight-chain alkane with 4 carbons.
- Solution:
- Parent chain: Butane (4 carbons)
- No substituents.
- Final name: butane

#### Problem 2:
- Structure: A straight-chain alkane with 5 carbons.
- Solution:
- Parent chain: Pentane (5 carbons)
- No substituents.
- Final name: pentane

#### Problem 3:
- Structure: A straight-chain alkane with 6 carbons.
- Solution:
- Parent chain: Hexane (6 carbons)
- No substituents.
- Final name: hexane

#### Problem 4:
- Structure: A straight-chain alkane with 7 carbons.
- Solution:
- Parent chain: Heptane (7 carbons)
- No substituents.
- Final name: heptane

#### Problem 5:
- Structure: A straight-chain alkane with 8 carbons.
- Solution:
- Parent chain: Octane (8 carbons)
- No substituents.
- Final name: octane

#### Problem 6:
- Structure: A straight-chain alkane with 9 carbons.
- Solution:
- Parent chain: Nonane (9 carbons)
- No substituents.
- Final name: nonane

#### Problem 7:
- Structure: A straight-chain alkane with 10 carbons.
- Solution:
- Parent chain: Decane (10 carbons)
- No substituents.
- Final name: decane

#### Problem 8:
- Structure: A branched alkane with 5 carbons and a methyl group at C-2.
- Solution:
- Parent chain: Pentane (5 carbons)
- Substituent: Methyl (-CH₃) at C-2
- Final name: 2-methylpentane

#### Problem 9:
- Structure: A branched alkane with 6 carbons and two methyl groups at C-2 and C-3.
- Solution:
- Parent chain: Hexane (6 carbons)
- Substituents: Methyl (-CH₃) at C-2 and C-3
- Final name: 2,3-dimethylhexane

#### Problem 10:
- Structure: A branched alkane with 7 carbons and a propyl group at C-3.
- Solution:
- Parent chain: Heptane (7 carbons)
- Substituent: Propyl (-C₃H₇) at C-3
- Final name: 3-propylheptane

#### Problem 11:
- Structure: A branched alkane with 8 carbons and a butyl group at C-4.
- Solution:
- Parent chain: Octane (8 carbons)
- Substituent: Butyl (-C₄H₉) at C-4
- Final name: 4-butyloctane

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Final Answers

1. butane
2. pentane
3. hexane
4. heptane
5. octane
6. nonane
7. decane
8. 2-methylpentane
9. 2,3-dimethylhexane
10. 3-propylheptane
11. 4-butyloctane

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Boxed Final Answer

\[
\boxed{
\begin{aligned}
1. & \text{ butane} \\
2. & \text{ pentane} \\
3. & \text{ hexane} \\
4. & \text{ heptane} \\
5. & \text{ octane} \\
6. & \text{ nonane} \\
7. & \text{ decane} \\
8. & \text{ 2-methylpentane} \\
9. & \text{ 2,3-dimethylhexane} \\
10. & \text{ 3-propylheptane} \\
11. & \text{ 4-butyloctane}
\end{aligned}
}
\]