IUPAC Nomenclature Practice Worksheet - Identify and name organic compounds.

The task is to name the organic compounds given their structural or condensed formulas using IUPAC nomenclature. Below, I will solve each problem step by step.

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1.1

Structural Formula:
\[
\text{CH}_3\text{CH}_2\text{COOCH}_2\text{CH}_3
\]

- This is an ester.
- The parent chain is a carboxylic acid derivative.
- The left side (before "O") is the acid part: propanoic acid.
- The right side (after "O") is the alcohol part: ethanol.
- Name: Ethyl propanoate

Answer: Ethyl propanoate

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1.2

Structural Formula:
\[
\begin{array}{c}
\text{CH}_3 \\
\text{C} \\
\text{|} \\
\text{C}=\text{C} \\
\text{|} \\
\text{CH}_3
\end{array}
\]

- This is a cycloalkene.
- The parent chain is a cyclopentane ring.
- There is a double bond between C-1 and C-2.
- The methyl group is on C-1.
- Name: 1-Methylcyclopentene

Answer: 1-Methylcyclopentene

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1.3

Structural Formula:
\[
\text{CH}_3\text{CH}_2\text{CH}_2\text{C}(\text{O})\text{CH}_2\text{CH}_3
\]

- This is a ketone.
- The parent chain is a hexane.
- The carbonyl group is on C-4.
- Name: 4-Hexanone

Answer: 4-Hexanone

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1.4

Structural Formula:
\[
\begin{array}{c}
\text{H} \\
\text{C} \\
\text{|} \\
\text{C}=\text{O} \\
\text{|} \\
\text{CH}_3\text{CH}_2
\end{array}
\]

- This is an aldehyde.
- The parent chain is a butane.
- The aldehyde group is on C-3.
- Name: 3-Methylbutanal

Answer: 3-Methylbutanal

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1.5

Condensed Formula:
\[
\text{CH}_3\text{CH}(\text{OCH}_3)\text{CH}_3
\]

- This is an ether.
- The parent chain is a propane.
- The oxygen atom is bonded to C-2 and a methoxy group (\(\text{OCH}_3\)) is attached to C-2.
- Name: 2-Methoxypropane

Answer: 2-Methoxypropane

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1.6

Structural Formula:
\[
\begin{array}{c}
\text{CH}_3\text{CH}_2 \\
\text{|} \\
\text{CH}_3\text{CH}-\text{CH}-\text{CH}-\text{CH}_3 \\
\text{|} \\
\text{CH}_3\text{CH}_2
\end{array}
\]

- This is an alkane with multiple substituents.
- The parent chain is a heptane.
- There are two ethyl groups: one on C-2 and one on C-5.
- Name: 2,5-Diethylheptane

Answer: 2,5-Diethylheptane

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1.7

Structural Formula:
\[
\begin{array}{c}
\text{NH}_2 \\
\text{C}=\text{O} \\
\text{|} \\
\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_3
\end{array}
\]

- This is an amide.
- The parent chain is a butane.
- The amide group is on C-4.
- Name: N-Butylformamide

Answer: N-Butylformamide

---

1.8

Structural Formula:
\[
\begin{array}{c}
\text{CH}_3 \\
\text{C}\equiv\text{C}-\text{CH}-\text{CH}_2-\text{CH}_3 \\
\text{|} \\
\text{CH}_3
\end{array}
\]

- This is an alkane with a triple bond and a substituent.
- The parent chain is a pentane.
- The triple bond is between C-2 and C-3.
- There is a methyl group on C-4.
- Name: 4-Methyl-2-pentyne

Answer: 4-Methyl-2-pentyne

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1.9

Condensed Formula:
\[
(\text{CH}_3)_2\text{CHCH}(\text{CH}_3)\text{COCH}_2\text{CH}_3
\]

- This is a ketone.
- The parent chain is a hexane.
- The carbonyl group is on C-4.
- There are two methyl groups: one on C-2 and one on C-3.
- Name: 2,3-Dimethyl-4-hexanone

Answer: 2,3-Dimethyl-4-hexanone

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Final Answers:

1.1: Ethyl propanoate
1.2: 1-Methylcyclopentene
1.3: 4-Hexanone
1.4: 3-Methylbutanal
1.5: 2-Methoxypropane
1.6: 2,5-Diethylheptane
1.7: N-Butylformamide
1.8: 4-Methyl-2-pentyne
1.9: 2,3-Dimethyl-4-hexanone

\boxed{
\begin{array}{c}
\text{1.1: Ethyl propanoate} \\
\text{1.2: 1-Methylcyclopentene} \\
\text{1.3: 4-Hexanone} \\
\text{1.4: 3-Methylbutanal} \\
\text{1.5: 2-Methoxypropane} \\
\text{1.6: 2,5-Diethylheptane} \\
\text{1.7: N-Butylformamide} \\
\text{1.8: 4-Methyl-2-pentyne} \\
\text{1.9: 2,3-Dimethyl-4-hexanone}
\end{array}
}