Ch.22 - Organic Chemistry

Tro - Chemistry: A Molecular Approach 6th Edition

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Tro 6th Edition

Ch.22 - Organic Chemistry

Problem 91a

Chapter 22, Problem 91a

Identify each organic compound as an alkane, alkene, alkyne, aromatic hydrocarbon, alcohol, ether, aldehyde, ketone, carboxylic acid, ester, or amine, and provide a name for the compound. a.

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Identify the functional group present in the compound. The structure shows a carbon double-bonded to an oxygen and single-bonded to a hydrogen, which is characteristic of an aldehyde group.

Count the number of carbon atoms in the longest continuous chain that includes the aldehyde group. In this structure, there are five carbon atoms.

Determine the root name based on the number of carbon atoms. For five carbon atoms, the root name is 'pent'.

Since the compound is an aldehyde, the suffix '-al' is used. Combine the root name with the suffix to form the name 'pentanal'.

Verify the structure to ensure there are no other functional groups or branches that need to be considered in the naming process. In this case, the structure is a straight chain with no additional functional groups or branches.

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Key Concepts

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

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In organic chemistry, the presence of functional groups such as carbonyls, hydroxyls, and carboxyls determines the classification of compounds. For example, the carbonyl group (C=O) is a key feature of aldehydes and ketones.

Aldehydes

Aldehydes are organic compounds that contain a carbonyl group (C=O) bonded to at least one hydrogen atom. They are characterized by the general formula RCHO, where R represents a hydrocarbon chain. Aldehydes are typically found at the end of carbon chains, making them distinct from ketones, which have the carbonyl group located within the chain.

Nomenclature of Organic Compounds

The nomenclature of organic compounds follows systematic rules established by the International Union of Pure and Applied Chemistry (IUPAC). This includes identifying the longest carbon chain, determining the functional groups present, and assigning appropriate suffixes and prefixes. For aldehydes, the suffix '-al' is used, indicating the presence of the carbonyl group at the terminal position.

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