IUPAC Nomenclature of Alkanes-Part A worksheet - Free Printable

To solve the problem of giving the IUPAC names for the given hydrocarbons, we need to follow the rules of IUPAC nomenclature. Here's a step-by-step explanation for each compound:

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a)


- Analysis: This is a branched alkane.
- The longest carbon chain has 5 carbons: pentane.
- There are two methyl groups (–CH₃) on the second and third carbons.
- IUPAC Name: 2,3-Dimethylpentane

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b)


- Analysis: This is a branched alkane.
- The longest carbon chain has 4 carbons: butane.
- There are two methyl groups (–CH₃) on the second carbon.
- IUPAC Name: 2,2-Dimethylbutane

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c)


- Analysis: This is a branched alkane.
- The longest carbon chain has 7 carbons: heptane.
- There are two methyl groups (–CH₃) on the third and fifth carbons.
- IUPAC Name: 3,5-Dimethylheptane

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d)


- Analysis: This is a branched alkane.
- The longest carbon chain has 5 carbons: pentane.
- There are two ethyl groups (–CH₂CH₃) on the second and fourth carbons.
- IUPAC Name: 2,4-Diethylpentane

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e)


- Analysis: This is an alkane with a chlorine substituent.
- The longest carbon chain has 4 carbons: butane.
- There is a chlorine atom (Cl) on the second carbon.
- IUPAC Name: 2-Chlorobutane

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f)


- Analysis: This is a branched alkane.
- The longest carbon chain has 5 carbons: pentane.
- There are three methyl groups (–CH₃) on the second and third carbons.
- IUPAC Name: 2,2,3-Trimethylpentane

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g)


- Analysis: This is a branched alkane with a bromine substituent.
- The longest carbon chain has 6 carbons: hexane.
- There are two methyl groups (–CH₃) on the second carbon.
- There is a bromine atom (Br) on the third carbon.
- IUPAC Name: 3-Bromo-2,2-dimethylhexane

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h)


- Analysis: This is a branched alkane with a fluorine substituent.
- The structure is already given in condensed form: CH₃CH₂C(CH₃)₂CH₂CH(F)CH(CH₂CH₃)CH₃.
- The longest carbon chain has 7 carbons: heptane.
- There are two methyl groups (–CH₃) on the third carbon.
- There is a fluorine atom (F) on the fifth carbon.
- There is an ethyl group (–CH₂CH₃) on the sixth carbon.
- IUPAC Name: 3,3-Dimethyl-5-fluoro-6-ethylheptane

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i)


- Analysis: This is a cycloalkane with a side chain.
- The ring has 6 carbons: cyclohexane.
- There is a methyl group (–CH₃) on the ring.
- IUPAC Name: Methylcyclohexane

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j)


- Analysis: This is a bridged cycloalkane.
- The structure has a 5-membered ring with two methyl groups (–CH₃) on the ring.
- IUPAC Name: 2,2-Dimethylbicyclo[2.1.0]pentane

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Final Answers:

1. a) 2,3-Dimethylpentane
2. b) 2,2-Dimethylbutane
3. c) 3,5-Dimethylheptane
4. d) 2,4-Diethylpentane
5. e) 2-Chlorobutane
6. f) 2,2,3-Trimethylpentane
7. g) 3-Bromo-2,2-dimethylhexane
8. h) 3,3-Dimethyl-5-fluoro-6-ethylheptane
9. i) Methylcyclohexane
10. j) 2,2-Dimethylbicyclo[2.1.0]pentane

Boxed Final Answer:
\[
\boxed{
\begin{array}{ll}
\text{a)} & \text{2,3-Dimethylpentane} \\
\text{b)} & \text{2,2-Dimethylbutane} \\
\text{c)} & \text{3,5-Dimethylheptane} \\
\text{d)} & \text{2,4-Diethylpentane} \\
\text{e)} & \text{2-Chlorobutane} \\
\text{f)} & \text{2,2,3-Trimethylpentane} \\
\text{g)} & \text{3-Bromo-2,2-dimethylhexane} \\
\text{h)} & \text{3,3-Dimethyl-5-fluoro-6-ethylheptane} \\
\text{i)} & \text{Methylcyclohexane} \\
\text{j)} & \text{2,2-Dimethylbicyclo[2.1.0]pentane} \\
\end{array}
}
\]