In aldehydes, the carbonyl carbon atom is bonded to a hydrogen atom, whereas in ketones the carbonyl carbon atom is bonded to another carbon atom.

Determine which of the following statements are true.

a. Ketones have lower boiling points than alcohols of similar size

b. Aldehydes with more than five carbon atoms are soluble in water, but not organic solvents.

c. Butanal has a higher boiling point than 2-butanol

d. Aldehydes contain a carbon-oxygen double bond.

e. Both aldehydes and ketones can hydrogen bond with water molecules.

f. Propanal is a gas at room temperature, whereas formaldehyde (methanal) is a liquid at room temperature.