Carboxyl Group

What is the characteristic functional group of carboxylic acids?

• Carbonyl

• Hydroxyl

• Carbon

• Carboxyl

Which compound has the highest boiling point?

• Butane

• Propanone

• Acetic acid

• 1-propanol

Which is the correct order of boiling points of carboxylic acids, from the lowest to the highest?

• methanoic acid, ethanoic acid, butanoic acid, propanoic acid

• methanoic acid, propanic acid, butanoic acid, ethanoic acid

• methanoic acid, ethanoic acid, propanoic acid, butanoic acid

• ethanoic acid, methanoic acid, propanoic acid, butanoic acid

Which of these carboxylic acids has the highest boiling point?

• Valeric acid

• Pentanedioic acid

• Acetyl acid

• Pentanoic acid

What is the main reason carboxylic acid has the highest boiling point as compared to other compounds with comparable mass?

• It has carboxyl functional group.

• It is a strong acid.

• It exists in a form of dimer.

• It can form hydrogen bond

What does miscible means?

• Can form hydrogen bonds with water.

• Mix with water in any proportion.

• Soluble in water and organic solvents.

• Dissolve in water to form hydrogen ions.

___________ is miscible in water.

• Propanoic acid

• Pentanoic acid

• Benzoic acid

• Hexanoic acid.

What factor can decrease the solubility of carboxylic acid in water?

• The increase in length of the hydrocarbon chain.

• The decrease in length of the hydrocarbon chain.

• The increase in number of carboxyl group.

• The number of hydrogen bond.

Which of these compounds is the most soluble in water?

• 1,2-propanediol

• Ethanoic acid

• Propanol

• ethanedioc acid

Choose the correct statement.

• Ethanoic acid is completely soluble in water because it can dimerise in the presence of water.

• Ethanoic acid is completely soluble in water because it has 2 carbon atoms.

• Ethanoic acid is completely soluble in water because it can form hydrogen bond and van der Waals forces with water molecules.

• Ethanoic acid is completely soluble in water because it has small hydrophobic group.