Amines

Definition: Are organic compounds that contain a nitrogen.

Least organic compounds:
 Primary amine: Methylamine
 Secondary amine: Dimethylamine
 Tertiary amine: Trimethylamine

Functional group:

Primary amine: R-NH2

Secondary amine: R2-NH

Tertiary amine: R3-NH

Esters

Definition: Are organic compounds derived from carboxylic acids. A carboxylic acid contains the -COOH carboxyl group, and in an ester the hydrogen in the group is replaced by a hydrocarbon group of some kind. This could be an alkyl group like methyl or ethyl, or one containing a benzene ring like phenyl.

Least organic compound: Methylmethanoate COOHCH3

Functional group:

O = C - O - R

R   .

Physical properties:

Boiling pointsThe small esters have boiling points which are similar to those of aldehydes and ketones with the same number of carbon atoms.

Molecule	Type	Boiling point
CH3COOCH2CH3	Ester	77,1
CH3CH2CH2COOH	Carboxylic acid	164

Solubility in water
The small esters are fairly soluble in water but solubility falls with chain length.

Molecule	Type	Boiling point
CH3COOCH2CH3	Ester	77,1
CH3CH2CH2COOH	Carboxylic acid	164

Carboxylic acids

Definition: Are organic compounds containing a carboxyl group attached to it.

Least organic compound: Methanoic acid COOH

Functional group:

R - C = O

O

Physical properties: The boiling points of carboxylic acids of similar size are higher still. The reason for the solubility is that although aldehydes and ketones can't hydrogen bonds with themselves, they can hydrogen bond with water molecules. The carboxylic acids with up to four carbon atoms will mix with water in any proportion.

IUPAC name	Molecular weight	Boiling point	Formula
Butane	58	0	CH3CH3CH2CH3
Propanol	60	97	CH3CH2CH2OH
Ethylmetherether	60	6	CH3-O-CH2CH3
Propanal	58	49	CH3CH2CH=O
Propanoic acid	60	118	CH3CH2COOH

Aldehydes and Ketones

Aldehydes definition: Are compounds containing a carbonyl group with at least one hydrogen attached to it.

Least organic compound: Methanal O=CH2

Ketones definition: Are compounds containing a carbonyl group with two hydrocarbons attached to it.

Least organic compound: Ethanone CH2-CH=O

Structure: They are organic compounds which incorporate a carbonyl group, that is functional, C=O. The carbon atom has two remaining bonds that may be occupied by hydrogen or arkyl or aryl substituents. If, at least one of these is hydrogen, it is an aldehyde. If neither is hydrogen, it is a ketone.

R1    .

 C = O

R2    .

Physical properties: They can H-bond with water, because they have an O atom. The small ones are freely soluble in water, but solubility falls with chain length. The reason for solubility is that although they can't H-bond with themselves, they can with water molecules.

IUPAC name	Molecular weight	Boiling point	Formula
Butane	58	0	CH3CH3CH2CH3
Propanol	60	97	CH3CH2CH2OH
Ethylmetherether	60	6	CH3-O-CH2CH3
Propanal	58	49	CH3CH2CH=O