In the IUPAC system, primary amines are named as alkanamines by replacing the ‘e’ of the alkane with the word “amine.” For amines with multiple amino groups, positions are specified by numbering the carbon atoms with -NH₂ groups and using ...
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Aliphatic amines are named by prefixing the alkyl group to “amine” as one word (e.g., methylamine). In secondary and tertiary amines with identical alkyl groups, the prefix di or tri is added before the alkyl group name.
Tertiary amines are formed by replacing another hydrogen atom in a secondary amine with an alkyl/aryl group. Amines are ‘simple’ when all the alkyl or aryl groups are the same and ‘mixed’ when they are different.
A secondary amine, such as R-NHR’, is formed when two hydrogen atoms of ammonia or one hydrogen atom of R-NH₂ are replaced by another alkyl/aryl group (R’).
Amines are classified as primary (1⁰), secondary (2⁰), and tertiary (3⁰) depending on the number of hydrogen atoms replaced by alkyl or aryl groups in the ammonia molecule.
The presence of an unshared pair of electrons on nitrogen causes the angle C–N–E (where E is C or H) to be less than 109.5°; for example, it is 108° in trimethylamine.
Carboxylic acids are weaker than mineral acids but stronger than alcohols and many simple phenols. The pKₐ is approximately 16 for ethanol and 10 for phenol.
Aliphatic carboxylic acids with up to four carbon atoms are miscible in water due to hydrogen bond formation. However, solubility decreases with an increasing number of carbon atoms. Higher carboxylic acids become practically insoluble in water due to increased hydrophobic ...
Carboxylic acids have higher boiling points due to more extensive intermolecular hydrogen bonding. These bonds persist even in the vapour phase, with most carboxylic acids existing as dimers in the vapour phase or in aprotic solvents.
Aliphatic carboxylic acids up to nine carbon atoms are colourless liquids with unpleasant odours, while higher acids are wax-like solids with low volatility, resulting in practically odourless characteristics.