Verified Solution • 2025–26 Session moderate

QJEEM19Che34a: JEE Main 2019 Chemistry - Class 12 JEEM19Che34a Solution: The coordination numbers of Co and Al in [Co(Cl)(en) 2 ]Cl and…

The coordination numbers of Co and Al in [Co(Cl)(en)2]Cl and K3[Al(C2O4)3], respectively, are : (en = ethane-1, 2-diamine)

Multiple Choice Options

  • A 3 and 3
  • B 6 and 6
  • C 5 and 3
  • D 5 and 6

Step-by-Step Verified Solution

Here in [Co(Cl)(en)2]Cl
'Cl' is monodentate so one coordinate linkage will be made with Co.
'en' is bidentate so two coordinate linkage will be made with Co. There are two 'en ' present so 4 coordinate linkage will be made with Co.
∴ Total 5 coordinate linkage will be made with Co by Cl and en. So C.N. of Co is 5.

Here in K3[Al(C2O4)3]
C2O4-2 is bidentate so two coordinate linkage will be made with Al. There are three C2O4-2' present so 6 coordinate linkage will be made with Al.
∴ So C.N. of Al is 6.

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