JEE Advanced · Chemistry · 23. Coordination Compounds

The pair(s) of complexes wherein both exhibit tetrahedral geometry is(are)
(Note: $py =$ pyridine Given: Atomic numbers of $Fe, Co, Ni$ and $Cu$ are $26, 27, 28$ and $29$ , respectively)

A ${[{FeCl}_{4}]}^{-}$ and ${[Fe {(CO)}_{4}]}^{2 -}$
B ${[Co {(CO)}_{4}]}^{-}$ and ${[{CoCl}_{4}]}^{2 -}$
C $[Ni {(CO)}_{4}]$ and ${[Ni {(CN)}_{4}]}^{2 -}$
D ${[Cu {(Py)}_{4}]}^{+}$ and ${[Cu {(CN)}_{4}]}^{3 -}$

Verified Solution

Answer & Solution

Correct Answer

(A) ${[{FeCl}_{4}]}^{-}$ and ${[Fe {(CO)}_{4}]}^{2 -}$

Step-by-step Solution

Detailed explanation

{[{FeCl}_{4}]}^{-}

{sp}^{3}

Tetrahedral

{[Fe {(CO)}_{4}]}^{2 -}

{sp}^{3}

Tetrahedral (Isoelectronic to

Ni {(CO)}_{4}

)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Columns 1, 2 and 3 contain starting materials, reaction conditions and type of reactions respectively.

Column 1	Column 2	Column 3
(I) Toulene	(i) $NaOH$ $ /Br _2$	(P) Condensation
(II) Acetophenone	(ii) $B r_2 / h v$	(Q) Carboxylation
(III) Benzaldehyde	(iii) $\left( CH _3 CO \right)_2$ $O / CH _3$ $COOK$	(R) Substitution
(IV) Phenol	(iv) $NaOH$ $/CO _2$	(S) Haloform

For the synthesis of benzoic acid the only correct combination is

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In a metal deficient oxide sample, $\mathbf{M}_{\mathbf{x}} \mathbf{Y}_2 \mathbf{O}_4$ ( $\mathbf{M}$ and $\mathbf{Y}$ are metals), $\mathbf{M}$ is present in both +2 and +3 oxidation states and $\mathbf{Y}$ is in +3 oxidation state. If the fraction of $\mathbf{M}^{2+}$ ions present in $\mathbf{M}$ is $\frac{1}{3}$, the value of $\mathbf{X}$ is ________.

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The pair(s) of complexes wherein both exhibit tetrahedral geometry is(are)(Note: py= pyridine Given: Atomic numbers of Fe, Co, Ni and Cu are 26, 27, 28 and 29, respectively)

Step-by-step Solution

The pair(s) of complexes wherein both exhibit tetrahedral geometry is(are)
(Note: $py =$ pyridine Given: Atomic numbers of $Fe, Co, Ni$ and $Cu$ are $26, 27, 28$ and $29$ , respectively)