Textbook Question
Draw the structure of each carboxylic acid or ester. a. pentanoic acid
22. Organic Chemistry
Naming Carboxylic Acids
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If the substituent name of the OH group is hydroxy in the presence of a carboxylic acid, provide the systematic name for the following compound.
A
5-ethyl-4-hydroxyoctanoic acid
B
4-ethyl-5-hydroxyoctanoic acid
C
5- isopropyl-4-hydroxyoctanoic acid
D
4-isopropyl-5-hydroxyoctanoic acid
Verified step by step guidance1
Identify the longest carbon chain that includes the carboxylic acid group. In this case, the longest chain is an octane chain, which is 8 carbons long.
Number the carbon chain starting from the carboxylic acid group, which is given the highest priority in naming. This means the carboxylic acid carbon is carbon 1.
Identify and name the substituents attached to the main carbon chain. In the image, there is an ethyl group and a hydroxy group as substituents.
Determine the position of each substituent on the carbon chain. The ethyl group is on carbon 4, and the hydroxy group is on carbon 5.
Combine the names of the substituents with the main chain name, ensuring substituents are listed in alphabetical order. The correct systematic name is 4-ethyl-5-hydroxyoctanoic acid.
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