covalent bonding

coordinate bonding

synergic bonding

ionic bonding

One-Co Co bond, six terminal CO and two bridging CO

One-Co Co bond, four terminal CO and four bridging CO

No-Co Co bond, six terminal CO and two bridging CO

No-Co Co bond, four terminal CO and four bridging CO

Higher ionic radius of the metal ion

Higher charge/size ratio of the metal ion

Lower ionisation potential of the metal ion

Lower basicity of the ligand

'C-O' bond is strongest in the cation and weakest in the anion

'C-O' bond order is less in the cation than in anion

'C-O' bond longer in the cation than in anion or neutral carbonyl

'M-C' bond order is higher in the carbon than in anionic or neutral carbonyl.

$Cr(CO) _3(NO) _2$

$Fe(CO) _2(NO) _2$

$Cr(NO) _4$

$Ni(CO) _2(NO) _2$

200, 200

193, 200

200, 193

193, 193

The ${{\text{d}} _{{\text{C - O}}}}$ (bridging) is greater than ${{\text{d}} _{{\text{C - O}}}}$ (terminal)

The bond order of bridging C-O bond is greater than that of terminal C-O bond

The E.A.N. value of each Fe-atom is 35

the oxidation state of Fe in this complex is (-1)

It is $\sigma {\text{ - \pi }}$ bonded organometallic compound

In the complex value of x = 6

Int he complex CO is ${\text{\pi }} - {\text{acid}}$ ligand

It is trigonal bipyramidal shape

${\left[ {{\text{Cr}}{{\left( {{\text{CO}}} \right)} _{\text{6}}}} \right]^ + }$

$\left[ {{\text{Fe}}{{\left( {{\text{CO}}} \right)} _5}} \right]\;$

${\left[ {{\text{V}}{{\left( {{\text{CO}}} \right)} _{\text{6}}}} \right]^{\text{ - }}}$

all have equation

In ${Mn} _{2}{(CO)} _{10}$ bond order of $Mn-Mn$ is $0$

In ${Fe} _{2}{(CO)} _{9}$ bond order of $Fe-Fe$ is $1$

In $Ni{(CO)} _{4}$, all bond length are same

$Fe{(CO)} _{5}$ is diamagnetic

${C} _{2}{H} _{5}MgBr$

$K[Pt({C} _{2}{H} _{4}){Cl} _{2}]$

$Ni{(CO)} _{4}$

$Al{(O{C} _{2}{H} _{5})} _{3}$

2

4

6

Unpredictable

$H _{3}PO _{3}$ is dibasic and reducing

$H _{3}PO _{3}$ is dibasic and non-reducing

$H _{3}PO _{4}$ is tribasic and reducing

$H _{3}PO _{3}$ is tribasic and non-reducing

$[Fe(\eta ^{5}-C _{5}H _{5}) _{2}]$

$[PtCl _{3}(\eta ^{2}-C _{2}H _{4})]$

$[Co(CO) _{5}NH _{3}]^{2+}$

$Al(CH _{3}) _{3}$

$[Fe(\eta^{5} - C _5H _5) _2]$

$K[PtCl _3(\eta^{2} - C _2H _40]$

$[Co(CO) _5NH _3]^{+2}$

$Fe(CH _3) _3$

Na

Mg

Mn

Al

$[Co(NH _2) _6]^{2+}$

$[Co(CN) _6]^{3-}$

$[Co(NH _3) _6]^{3+}$

$[Co(CO) _6]^{3+}$

$C _{2}H _{5}MgBr$

$K\left [ Pt \left ( C _{2}H _{4} \right ) Cl _{3}\right ]$

$Ni\left ( CO \right ) _{4}$

$Al\left ( OC _{2}H _{5} \right ) _{3}$

In metal carbonyl complexes $d _{C-O}$ increases compared to that in CO molecule

The pair of compounds $[Cr(H _2O) _6]Cl _3$ and $[CrCl _3(H _2O) _3]\cdot 3H _2O$ show hydrate isomerism.

$d _{z^2}$ orbital of central metal atom/ion is used in $dsp^2$ hybridisation.

Facid and Meridional isomers associated with $[Ma _3b _3]^{n\pm}$ type complex compound, both are optically inactive.

$[(Ph _3P) _3Mo(CO) _3] > [(Ph _2PCl) _3Mo(CO) _3] > (PhPCl _2) _3 Mo (CO) _3]$

$[(Ph _3P) _3Mo(CO) _3] > [(Ph _2PCl) _3Mo(CO) _3] < (PhPCl _2) _3 Mo (CO) _3]$

$[(Ph _3P) _3Mo(CO) _3] = [(Ph _2PCl) _3Mo(CO) _3] > (PhPCl _2) _3 Mo (CO) _3]$

$[(Ph _3P) _3Mo(CO) _3] < [(Ph _2PCl) _3Mo(CO) _3] > (PhPCl _2) _3 Mo (CO) _3]$

$[Ni(CO) _4]$

$[Co(CO) _4]^{-}$

$[Fe(CO) _4]^{2-}$

$[Mn(CO) _6]^+$

$[V(CO) _6]^{-}$

$Fe(CO) _5$

$Ni(CO) _4$

$[Mn(CO) _6]^+$

$[V(CO) _6]^-$

$Fe(CO) _5$

$Ni(CO) _4$

$[Mn(CO) _6]^+$

$[V(CO) _6]^-$

$Fe(CO) _5$

$Ni(CO) _4$

$[Mn(CO) _6]^+$

$[V(CO) _6]^-$

$Fe(CO) _5$

$Ni(CO) _4$

$[Mn(CO) _6]^+$

[PtCl$ _3$(C$ _2$H$ _4$)]$^-$

[Ni(PF$ _3$)$ _4$]

[Cr(C$ _6$H$ _6$)$ _2$]

[Fe($\pi$-C$ _5$H$ _5$)$ _2$]

Al$ _2$(CH$ _3$)$ _6$

Pb(CH$ _3$)$ _4$

Zn(C$ _2$H$ _5$)$ _2$

Ferrocene

Metal carbonyls are the examples of only $\sigma$-bonded organometallic complexes.

Metal carbonyls are the examples of only $\pi$-bonded organometallic complexes.

Metal carbonyls are the examples of organometallic complexes which involve both $\sigma$- and $\pi$-bonds between metal and carbon of the carbonyl group.

Metal carbonyls involve both $\sigma$- and $\pi$-bonds between metal and oxygen of the carbonyl group.

[Mn(CO)$ _6$]$^+$

[Fe(CO)$ _5$]

[Cr(CO)$ _6$]

[V(CO)$ _6$]$^-$

$1.15$ $\overset{o}{A}$

$1.128$ $\overset{o}{A}$

$1.72$ $\overset{o}{A}$

$1.118$ $\overset{o}{A}$

(a) q,r,s,t; (b) p,q,r,t; (c) r,t; (d) r

(a)s,t; (b) p,q,r,t; (c) r; (d) r

(a) q,s,t; (b) q,r,t; (c) r,t; (d) r

(a) q,r,t; (b) q,r,t; (c) r;

1.15 $\overset{o}A$

1.128 $\overset{o}A$

1.72 $\overset{o}A$

1.178 $\overset{o}A$

True

False

$[Mn(CO) _6]^+$

$[Ti(CO) _6]^{2-}$

$[Cr(CO) _6]$

$[V(CO) _6]^-$

$[Ni(CO) _4] > [Ni(PF _3)(CO) _3]$

$[Ni(CO) _4] < [Ni(CO) _3 (PF _3)]$

$[Ni(CO) _4] = [Ni(PF _3)(CO) _3]$

Can not predicted