Carboxylic acid naming | Carboxylic acids and derivatives | Organic chemistry | Khan Academy

TL;DR

Learn how to systematically name carboxylic acids based on the longest carbon chain and the presence of a carboxyl group.

Transcript

Let's systematically name some carboxylic acids, so let's add a molecule that looked like this. Clearly a carboxylic acid, we have a carboxyl group right over here. Now to name it systematically, we do it just the way we've named our simple alkenes. When we first learned how to name any organic molecule, you look for the longest carbon chain. And t... Read More

Key Insights

• 🪘 Carboxylic acids can be systematically named by identifying the longest carbon chain and appending the appropriate prefix.
• 👥 The presence of a carboxyl group in a molecule indicates that it is a carboxylic acid.
• 🫀 The numbering of carbon atoms in carboxylic acids should start from the carboxyl carbon.
• 🧘 The position of other functional groups in carboxylic acids should be specified using numbers.
• 👥 Carboxylic acids with additional functional groups can be named by including the positions of these groups in the name.
• 🙃 The trans prefix is used to indicate that the functional groups in a carboxylic acid are on opposite sides of a double bond.
• 🆘 Systematic naming helps in accurately identifying and describing organic compounds.

Questions & Answers

Q: How do you systematically name carboxylic acids?

To name a carboxylic acid, identify the longest carbon chain and use the corresponding prefix. Add the suffix "-oic acid" to indicate the presence of the carboxyl group.

Q: Do carboxylic acids always have the carboxyl group at the end of the carbon chain?

Yes, the carboxyl group is always at one end of the carbon chain in carboxylic acids. Therefore, you don't need to specify its position when naming the compound.

Q: How do you name a carboxylic acid with additional functional groups?

Start numbering the carbon atoms from the carboxyl carbon and assign numbers to other functional groups accordingly. Include these numbers in the name of the compound to specify their positions.

Q: What is the significance of the trans prefix in naming carboxylic acids?

The trans prefix is used when the functional groups in a carboxylic acid are on opposite sides of a double bond. It indicates the spatial arrangement of the groups.

Summary & Key Takeaways

• Carboxylic acids can be named systematically by identifying the longest carbon chain and appending the appropriate prefix (e.g., but-, hex-).

• The presence of a carboxyl group in a molecule indicates that it is a carboxylic acid, and the suffix "-oic acid" is added to the name.

• The numbering of carbon atoms in carboxylic acids should start from the carboxyl carbon, and the position of other functional groups should be specified using numbers.