Examples of Functional Groups in Organic Molecules

📚 Quick Study Guide

• ⚛️ Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.
• 💧 Hydroxyl (-OH): Found in alcohols. Makes molecules more water-soluble.
• 🌿 Amino (-NH$_2$): Acts as a base. Important in amino acids and proteins.
• carbonyl group. Ketones have the carbonyl group within the carbon skeleton, while aldehydes have it at the end.
• 🍋 Carboxyl (-COOH): Acts as an acid. Found in carboxylic acids.
• 🔗 Ester (-COOC-): Formed from a reaction between a carboxylic acid and an alcohol.
• 🍂 Ether (-O-): Two organic groups connected by an oxygen atom.
• 🧪 Sulfhydryl (-SH): Found in thiols. Can form disulfide bridges in proteins.
• 🅿️ Phosphate (-OPO$_3^{2-}$): Important in energy transfer (ATP) and nucleic acids.

Practice Quiz

1. Which functional group is characteristic of alcohols?
   1. Hydroxyl
   2. Carbonyl
   3. Amino
   4. Carboxyl
2. Which functional group is commonly found in amino acids?
   1. Hydroxyl
   2. Sulfhydryl
   3. Amino
   4. Phosphate
3. A carbonyl group located at the end of the carbon skeleton indicates the presence of what?
   1. Ketone
   2. Alcohol
   3. Aldehyde
   4. Ether
4. Which functional group can act as an acid?
   1. Amino
   2. Hydroxyl
   3. Carboxyl
   4. Sulfhydryl
5. What type of bond can sulfhydryl groups form in proteins?
   1. Peptide bond
   2. Hydrogen bond
   3. Disulfide bridge
   4. Ionic bond
6. Which functional group is important for energy transfer in cells?
   1. Hydroxyl
   2. Carboxyl
   3. Amino
   4. Phosphate
7. What is the result of a reaction between a carboxylic acid and an alcohol?
   1. Aldehyde
   2. Ketone
   3. Ether
   4. Ester