In case, more than one
amino group is present at different positions in the parent chain, their
positions are specified by giving numbers to the carbon atoms bearing
–NH2 groups and suitable prefix such as di, tri, etc is attached to the
amine The letter ‘e’ of the suffix of the hydrocarbon part is retained For
example, H2N–CH2–CH2–NH2 is named as ethane-1, 2-diamine