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JEE Advance2021
Paper-2
Multiple correct answers - Select all that apply
Question
The pair(s) of complexes wherein both exhibit tetrahedral geometry is(are) (Note: py = pyridine Given: Atomic numbers of $\mathrm{Fe}, \mathrm{Co}, \mathrm{Ni}$ and Cu are $26,27,28$ and 29 , respectively)
Select ALL correct options:
A
$[\mathrm{FeCl} 4]^{-}$and $\left[\mathrm{Fe}(\mathrm{CO})_4\right]^{2-}$
B
$\left[\mathrm{Co}(\mathrm{CO})_4\right]^{-}$and $[\mathrm{CoCl} 4]^{2-}$
C
$\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ and $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$
D
$\left[\mathrm{Cu}(\mathrm{py})_4\right]_{\sim}^{+}$and $\left[\mathrm{Cu}(\mathrm{CN})_4\right]^{3-}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
⚠ Partially correct. Some answers are missing.
Solution
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