# The donor atoms in ethylenediamine

$(a)\;N\;and\;N\qquad(b)\;N\;and\;H\qquad(c)\;N\;and\;C\qquad(d)\;C\;and\;H$

The donor atoms in ethylenediamine N and N
There are 2 donor atoms in en i-e the 2 N atoms; each of which donates 1 lone pair of electrons to the metal ion.
Hence (a) is the correct answer.
edited Nov 11, 2017