The number of lines exhibited by a high resolution EPR spectrum of the species, $\left[\mathrm{Cu}(\text { ethylenediamine })_{2}\right]^{2+}$ is [Nuclear spin (I) of $\mathrm{Cu}=3 / 2$ and that of $\mathrm{N}=1$ ]
(a)12
(b)15
(c)20
(d)36
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Cu (I = 3/2) gives 4 lines; four equivalent N (I = 1) split each into 2·4·1 + 1 = 9: 36 lines.