MCQ
Which among the following orders of second $IP$ is correct
- A$Mn > Cr$
- B$Zn > Cu$
- ✓$Na > Cu$
- D$Cr > K$
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($R $ = alkyl group; $en$ = ethylenediamine)
(At. nos. $Ce = 58, Sm = 62,$$ Eu = 63, Yb = 70$)