JEE Main 2019 — Coordination Compounds Question with Solution
From: JEE Main 2019 (Online) 12th April Evening Slot
Question
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)
Choose an option
Show full solutionCorrect option: D
Correct answer
D5 and 6
Step-by-step explanation
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.
'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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This is a previous-year question from JEE Main 2019, covering the Coordination Compounds chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.