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Coordination Chemistry - Most Important Questions! (Download PDF)
1. The order of reactivity of ligands NMe3, PMe3 and CO with complexes MeTiCl3 and (CO)5Mo(Ph) are:
- Co > PMe3 > NMe3 and CO > NMe3 > PMe3
- PMe3 > CO > NMe3 and NMe3 > CO > PMe3
- NMe3 > PMe3 > CO and CO > PMe3 > NMe3
- NMe3 > CO > PMe3 and PMe3 > NMe3 > CO
2. The reaction of PtCl4 with NH3 gives product A while its reaction with [NO2]-2 followed by NH3 gives product B. The A and B respectively, are:
- Trans-[Pt(NH3) Cl2] and trans-[Pt(NH3) Cl2(NO2)]-
- Cis-[Pt(NH3) Cl2] and trans-[Pt(NH3) Cl2(NO2)]-
- Cis-[Pt(NH3) Cl2] and cis-[Pt(NH3) Cl2(NO2)]-
- Trans-[Pt(NH3) Cl2] and cis-[Pt(NH3) Cl2(NO2)]-
3. CFAE is also known as:
- The difference between CFSE of reactant and product
- The difference between CFSE of reactant and intermediate
- The Difference between CFSE of product and intermediate
- The CFSE of reactant only
4. Consider the following reaction:
- [Cr (H2O)6] +2 + [CO Cl (NH3)5] +2 → [Co(NH3)5H2O] +2 + [Cr Cl (H2O)5] +2
- [Fe(CN)6]-4 + [Mo(CN)8]-3 → [Fe(CN)6]-3 + [Mo(CN)8]-4
Which one of the following is the correct statement?
- Both involve an inner sphere mechanism.
- Both involve an outer sphere mechanism.
- Reaction (i) follows an inner sphere and reaction (ii) follows outer sphere mechanism.
- Reaction (i) follows an outer sphere and reaction (ii) follows an inner sphere mechanism.
5. The correct order of Trans effect is:
- H- > SCN- > H2O
- CO > C2H5 > Py > H2O
- C6H5- > I- <Py > -OH
- CO > H2O > CH3 > Py > CN
6. Mention the correct statement:
- Complexes having sp3d2 hybridization have strong bonds than the complexes having d2sp3
- Complexes having d2sp3 hybridization have strong bonds than the complexes having sp3d2
- Both have equal bond strength
- It cannot be decided
7. [Co(NH3)5X] +2 + H2O→ [Co(NH3)5(H2O)] +3 + X-
Mention the correct statement about the above reaction
- It is found to be second order
- It is found to be zero order
- H2O is involved in rate-determining step
- H2O does not affect the rate of reaction
8. Which of the following statements is/are true about Sn1 reactions?
(I) In Sn1 mechanism, the rate-determining the slowest step is the metal-ligand bond-breaking step.
(II) In Sn1 mechanism, the rate-determining the slowest step is the metal-ligand bond making step.
(III) In Sn1 mechanism, the coordination no. of the complex is decreased from 6 to 5.
- I and II
- I and III
- I, II and III
- Only I
9. The substitutionally inert complex ion amongst the following is:
- [Cr (H2O6] +3
- [Fe (H2O)6] +2
- [Cr (H2O)6] +2
- [Ni (H2O)6] +2
10. The reaction is an example of:
[Co(NH3)5Cl] + + Hg+2→[Hg(NH3)5Cl] + +Co+2
- Electrophilic substitution reaction
- Nucleophilic substitution reaction
- Electrophilic addition reaction
- Nucleophilic addition reaction
For (CO)5Mo(Ph), those ligands whose -acidity is more will react faster and thus have more reactivity. Since we know that, order of -acidity is CO > PMe3 > NMe3 so, the same is the order of reactivity here.
The reaction given follows the Trans-effect.
The order of trans effect is as follow: NO2 > Cl > NH3
So, when PtCl4 reacts with NH3, first NH3 replaces one Cl; and second NH3 goes to trans of Cl since trans effect of Cl > NH3
Similarly, when PtCl4 reacts with [NO2]-2, it replaces one Cl. Thereafter, reaction with NH3 makes NH3 to occupy position trans to [NO2]-2 because of the trans effect of NO2 > Cl > NH3.
In reaction (i), bridged activated complex is formed. Also, group transfer occurs.
While in reaction (ii), no bridging ligand is present and no group transfer occurs. It is also a type of Cross reaction.
It is the most common method of electron transfer. It occurs between complexes via a binding ligand
It occurs between separate chemical species. Also, it occurs between complexed that do not undergo substitution
Oxidant and reductant
Lined via covalent bond
Separate and intact
Electron transfer method
Through the covalent bond
By force through the space
Electron transfer occurs after the formation of a bridging intermediate
Does not involve any bridging intermediate formation
The order of trans-effect is: CN > CO > NO > C2H5 > PR3 > H > C6H5 > NO2 > I > SCN > Br > Cl > Py > NH3 > OH > H2O
Complexes having d2sp3 hybridisation involves use of inner orbitals, thus form strong bonds whereas complexes having sp3d2 hybridisation involves use of outer orbitals and are much less strong than outer orbital complexes.
It is an example of an acid hydrolysis reaction.
The rates of hydrolysis of reactions of this type have been studied and found to be FIRST ORDER reactions.
Since in aqueous solution, concentration of water is always constant, the effect of changes in water concentration on rate of reaction cannot be determined.
Rate law for this reaction becomes: rate = k'Co NH35X+2[ H2O]. Thus, the rate law does not tell us whether water is involved in rate-determining step.
Order of inertness is: L.S. Oh > d3 = d8 (Oh H.S. and L.S.) > d4 (Oh L.S.) > d5 (Oh L.S.)
Cr+3 is d3 Fe+2 is d6 Cr+2 is d4 Ni+2 is d8
So, Cr+3 is most inert of all.
Hg+2 substitutes Cobalt in this reaction and becomes Hg(0) indicating it’s an Electrophilic Substitution Reaction.
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