Organometallic chemistry Questions with detailed solution| Inorganic

Top six important questions in organometallic chemistry chapter for CSIR NET GATE IIT JAM and corresponding other entrance examination and practice.

Organometallic chemistry-2

Hello everyone day we will discuss Organometallic chemistry question and answer in inorganic chemistry. Top six important questions in organometallic chemistry chapter for CSIR NET GATE IIT JAM and corresponding other entrance examination as well as practice purpose. So please check the below section we have to discuss.

We have to question answers and discuss a solution. Those questions are helpful for a chemical student as well as a research fellow and entrance examination aspirants.

Which books are best for Organometallic chemistry?

Before reading any books, students will follow tutor notes or privet teachers for concept clearing. Teachers who help you to the current roots of organometallic chemistry. After this, you can read any books that help you with lots of information and practice questions and answers. 

Or You can follow the popular books Inorganic chemistry Principles of Structure and Reactivity by James E. Huheey, Ellen A. Keiter Richard L. Keiter. This book is for Basic as well as advanced level informative a student. Or Ajay Kumar Organometallic chemistry books provide topic ways discussion with relevant questions. Those books are important for an entrance exam aspirant.

How do solve organometallic chemistry questions very quickly?

First of all, we have to suggest that maximum of topic clear through any books or privet teachers or any tuition notes. After that attempt the question we will discuss. Then this session is helpful for you otherwise not. So go through this click here and read those books for specific organometallic chemistry then come back to our session and practice questions and answers.

If your concept is clear then you immediately continue to our session that is helpful for you.

Questions and answers for Organometallic chemistry with the solution:

Now we have to solve a few questions with the proper responses that help you practice the concept approach.

Q.1. Identify the species, that obey the 18-electron rule, from the following:

1. A and B         2. B and C

3. C and D        4. A and D

this the Organometallic chemistry-2 question-1
Organometallic chemistry-2 question-1


Answer: Correct option is (4) A and D

Hints:

According to the 18 electron rule, the number of electrons counts in a given metal complex: Where the Electron count of Cu is 11, similarly Mn: 7  Cr: 6  V: 5.

This is the 18 electrons rule for stabilization. This is for organometallic chemistry.
18 electrons rule for stabilization.


Neutral Carbon monoxide CO electrons count is 2.  And η5 - Cp electron count is 5 each.


Q.2. The number of metal-metal bonds in [Co2Fe2(CO)11(μ4-PPh)2] is

A. 3       B. 4

C. 5       D. 6

this the Organometallic chemistry-2 question-2
Organometallic chemistry-2 question-2

Answer: Correct option is (B). 4

Hints:

The number of Metal-Metal bond = (18n - V.E) / 2

Where n is the total number of metal presents in the metal complex. And V.E = Velence Electrons count

This is the image of the metal-metal bond count
This is the image of the metal-metal bond count

The valence electron count of metal complex [Co2Fe2(CO)114-PPh)2] is 9 × 2 + 8 ×2 + 11 × 2 + 2 × 4 = 18 + 16 + 22 +8 = 64.

Velence electron of Cobalt is 9 and Iron (Fe) is 8.

The number of metals is 4 which are present in the metal complex. 

The number of Metal-Metal bond = (18n - V.E) / 2   = (18 × 4 - 64) / 2 = (72 - 64) / 2 = 8 /2 = 4.

Therefore the total number of  M-M bonds present in the complex is 4.

Relevant topic:

Q.3. The following transformation is an example of

A.  Oxidative addition

B.  Insertion

C.   β-hydride elimination

D.  Reductive elimination

This the Organometallic chemistry-2 question-3
Organometallic chemistry-2 question-3


Answer: correct option is (c) β-hydride elimination

Hints:

Metal-alkyl complexes are unstable if they have β-hydrogen. Because the Metal-alkyl complex favors the β-elimination reaction if possible. That is why in the presence of β-hydrogen the metal-alkyl complex decomposition via β-hydride elimination and the formation of a stable π complex.

  • β-elimination occurs in the cis or syn position.
  • β-hydride elimination favors sp3 hybridized.

This is the image of the Beta elimination reaction.
This is the image of the Beta elimination reaction.


Q.4. The oxidation state of gold in the following complex is

A. 0        B. 1

C. 2        D. 3

This is the Organometallic chemistry-2 question-4
This is the Organometallic chemistry-2 question-4


Answer: Correct option is (c) 2

Hints:

The Oxidation state of Au is 2. This type of complex is formed by Au(II) dinuclear core.

Q.5. The number of bridging ligand(s) and metal-metal bond(s) present in the complex [Ru2(η5 - Cp)2(CO)2(Ph2PCH2PPh2)] (obeys 18-electron rule), respectively, are

A. 0 and 1       B. 2 and 1

C. 3 and 1       D. 1 and 2

This is the Organometallic chemistry-2 question-5
This is the Organometallic chemistry-2 question-5


Answer: Correct option is (C). 3 and 1

Hints:

The number of Metal-Metal bond = (18n - V.E) / 2

Where n is the total number of metal presents in the metal complex. And V.E = Velence Electrons count.

The valence electron count of metal complex [Ru2(η5 - Cp)2(CO)2(Ph2PCH2PPh2)] is 2 × 8 + 2×5 + 2 × 2 + 2 × 2 = 16 + 10 + 4 + 4 = 34.

Velence electron of  Ruthenium is 8 and

Legend of Metal Complex Electron count
η5 - Cp5
CO2
Ph2PCH2PPh24
Ru Metal 8
The number of metals is 2 which are present in the metal complex. 

The number of Metal-Metal bond = (18n - V.E) / 2   = (18 × 2 - 34) / 2 = (36 - 34) / 2 = 82/2 = 1.

Here Ph2PCH2PPh2  is a bridging ligand and both CO may be either bridging ligands or it may be terminal ligands. But we conclude that both CO bridging ligand because given option follows.

Metal-Metal bond count and bridging ligand count.
Metal-Metal bond count and bridging ligand count.

In case option (B) is not correct because Asymmetry Bridging Complex is Unstable. In the case given complex follow the 18 electron rules therefore the metal complex will be stable form.

So, Option (C) is correct because follows the 18 electron stabilization via 3-bridging ligand and 1 Metal-Metal bond.

Q.6. The rate of alkene coordination to [PtCl4]2- is highest for

A. norbornene         B. ethylene

C. cyclohexene       D. 1-butene

This is the Organometallic chemistry-2 question-6
This is the Organometallic chemistry-2 question-6


Answer:

Hints:

The reactivity order of alkene follows:   Norbornene > cyclohexane > 1-butene > ethylene.

Norbornene compound is more reactive due to more substituted than Cyclohexane. We know that More substituted alkene is highly reactive compared to less substituted alkyl. That is why cyclohexane is less reactive compared to norbornene.


This is the image of Reactivity order of alkene
Reactivity order of alkene

Similarly, 1-butene is highly reactive compared to ethylene.

Related questions and answers Article:

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