Which of the following does not have a metal-carbon bond:

1. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{MgBr}$

2. $\mathrm{K}\left[\mathrm{Pt}\left({\mathrm{C}}_2{\mathrm{H}}_4\right){\mathrm{Cl}}_3\right]$

3. $\mathrm{Ni}(\mathrm{CO}{)}_4$

4. $\mathrm{Al}{\left({\mathrm{OC}}_2{\mathrm{H}}_5\right)}_3$

Anticancer agent among the following is:

1.		2.
3.		4.

In an octahedral structure, the pair of d orbitals involved in d²sp³ hybridization is:

1. ${\mathrm{d}}_{\mathrm{xz}},{\mathrm{d}}_{\mathrm{x}}^2-{\mathrm{y}}^2$

2. ${\mathrm{d}}_{\mathrm{z}}^2,{\mathrm{d}}_{\mathrm{xz}}$

3. ${\mathrm{d}}_{\mathrm{xy}},{\mathrm{d}}_{\mathrm{yz}}$

4. ${\mathrm{d}}_{\mathrm{x}}^2-{\mathrm{y}}^2,{\mathrm{d}}_{\mathrm{z}}^2$

CN^– is a strong field ligand. This is due to the fact that:

1. It is a pseudohalide.

2. It can accept electrons from metal species.

3. It forms high-spin complexes with metal species.

4. It carries a negative charge.

Considering H₂O as a weak field ligand, the number of unpaired electrons in \([Mn(H_{2}O)_{6}]^{2+}\) will be:
(At. no. of Mn = 25)

Among [Ni(CO)₄], [Ni(CN)₄]²⁻, [ NiCl₄]²⁻ species, the hybridization states of the Ni atom are respectively:
(At. No. of Ni = 28)

Coordination compound that would exhibit optical isomerism is:

The atomic numbers of Cr and Fe are respectively 24 and 26. Among the following, the one that is paramagnetic with the spin of the electron is:

1. CrCO₆

2. FeCO₅

3. [Fe(CN)₆]^4-

4. [Cr(NH₃)₆]³⁺

The hypothetical complex
chlorodiaquatriamminecobalt(III) chloride can be
represented as:

1. $\left[\mathrm{CoCl}{\left({\mathrm{NH}}_3\right)}_3{\left({\mathrm{H}}_2\mathrm{O}\right)}_2\right]{\mathrm{Cl}}_2$

2. $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3\left({\mathrm{H}}_2\mathrm{O}\right){\mathrm{Cl}}_3\right]$

3. $\left[\mathrm{Co}{\left({\mathrm{NH}}_2\right)}_3{\left({\mathrm{H}}_2\mathrm{O}\right)}_2\mathrm{Cl}\right]$

4. $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\left({\mathrm{H}}_2\mathrm{O}\right)}_3{\mathrm{Cl}}_3\right]$

CuSO₄ when reacts with KCN forms CuCN, which is insoluble in water.
It is soluble in excess of KCN, due to the formation of the following complex:

1. K₂[Cu(CN)₄]

2. K₃[Cu(CN)₄]

3. CuCN₂

4. Cu[KCu(CN)₄]