The shape of Fe(CO)₅ is:

Mg is present in:

The organometallic compound that is σ and $\mathrm{\pi }$ bonded is:

1. $\left[Fe{({\eta }^5-C_5{H}_5)}_2\right]$

2. $K\left[PtC{l}_3\right({\eta }^2-C_2{H}_4\left)\right]$

3. ${\left[Co{\left(CO\right)}_{5}N{H}_3\right]}^{+2}$

4. $Fe{\left(C{H}_3\right)}_3$

A metal ion present in vitamin B₁₂ is:

The compound that is not a $\mathrm{\pi }$-bonded organometallic compound is:

1. $\mathrm{K}\left[{\mathrm{PtCl}}_3\right({\mathrm{\eta }}^2-{\mathrm{C}}_2{\mathrm{H}}_4\left)\right]$

2. $\mathrm{Fe}{({\mathrm{\eta }}^5-{\mathrm{C}}_5{\mathrm{H}}_5)}_2$

3. $\mathrm{Cr}{({\mathrm{\eta }}^6-{\mathrm{C}}_6{\mathrm{H}}_6)}_2$

4. ${\left({\mathrm{CH}}_3\right)}_4\mathrm{Sn}$

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.