* Optical Isomers: Optical isomers (enantiomers) occur when a molecule has a chiral center – a carbon atom bonded to four different groups. 2-methylpropanamine does not have a carbon atom with four different groups. The nitrogen atom is bonded to three different groups (two hydrogens, one methyl, and one propyl group), and the fourth group is a lone pair of electrons.
* Geometric Isomers: Geometric isomers (cis/trans isomers) arise from restricted rotation around a double bond or a cyclic system. 2-methylpropanamine has neither a double bond nor a cyclic structure.
In summary, 2-methylpropanamine lacks the necessary structural features for either optical or geometric isomerism.
