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Ch.21 - Organic Chemistry
Chapter 21, Problem 76d

Draw the structure of each aldehyde or ketone. d. 4-heptanone

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1
Identify the parent chain: The name '4-heptanone' indicates a seven-carbon chain (heptane) with a ketone group.
Locate the ketone group: The '4-' in '4-heptanone' specifies that the carbonyl group (C=O) is on the fourth carbon of the chain.
Draw the carbon chain: Start by drawing a straight chain of seven carbon atoms.
Add the carbonyl group: Place a double-bonded oxygen (O) on the fourth carbon of the chain to represent the ketone group.
Complete the structure: Add hydrogen atoms to each carbon atom to satisfy the tetravalency of carbon, ensuring each carbon forms four bonds.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Aldehydes and Ketones

Aldehydes and ketones are organic compounds characterized by the presence of a carbonyl group (C=O). Aldehydes have the carbonyl group at the end of the carbon chain, while ketones have it within the chain. This structural difference influences their chemical properties and reactivity.
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Carbon Chain Length

The carbon chain length in organic compounds refers to the number of carbon atoms connected in a linear or branched arrangement. In the case of 4-heptanone, 'heptan' indicates a seven-carbon chain, and the '4-' specifies the position of the carbonyl group, which is crucial for accurately drawing the structure.
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Structural Representation

Structural representation in chemistry involves depicting the arrangement of atoms within a molecule. For aldehydes and ketones, this includes showing the carbonyl group and the carbon chain. Understanding how to represent these structures is essential for visualizing molecular interactions and predicting chemical behavior.
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