Name bidentate lignads with (i) two neutral donor groups and (ii) two acid groups.

Explanation

Bidentate group with two neutral donor group:
`underset("ethylenediammine")(NH_(2)-CH_(2)-CH_(2)-NH_(2))`
`underset("trimethylenediammine")(NH_(2)-CH_(2)-CH_(2)-CH_(2)-NH_(2))`
With acid groups : `underset("oxalalate ion")(.^(-)OOC-COO^(-))`