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Organometallic Compounds


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20 Questions MCQ Test GATE Chemistry Mock Test Series | Organometallic Compounds

Organometallic Compounds for Chemistry 2022 is part of GATE Chemistry Mock Test Series preparation. The Organometallic Compounds questions and answers have been prepared according to the Chemistry exam syllabus.The Organometallic Compounds MCQs are made for Chemistry 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Organometallic Compounds below.
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Organometallic Compounds - Question 1

The complex (X) react with nucleophilies (R-) to give stable, neutral metal alkyl complex (Y). The product (Y) is

Detailed Solution for Organometallic Compounds - Question 1

Organometallic Compounds - Question 2

The 1HNMR spectrum of  at -800C and at 300C are respectively

Detailed Solution for Organometallic Compounds - Question 2

At high temperature(300C) due to fast 1,2-meta shift,  mode looks like  mode. Hence, two signal. At low temperature, this rate is very slow, hence four signal corresponding to 4-types of hydrogen atom. Hence, (X and Y).

Organometallic Compounds - Question 3

The major product in the above reaction is

Detailed Solution for Organometallic Compounds - Question 3

Bridging carbonyl is more basic than terminal hence Lewis acid attack at bridging carbonyl. Hence, correct option is (a)

Organometallic Compounds - Question 4


The v c-o stretching frequency

Detailed Solution for Organometallic Compounds - Question 4

In B due to presence of methyl group, it will donate more electron density to metal. Hence, more back donation therefore, less value of v c-o. 

Organometallic Compounds - Question 5

The compound  has a single 'CO' stretching absorption at 1761cm-1. The IR data indicate that all C5H5 ligands are pentane to and probably in identical environment. On the basis of these data which of the following statement is true

Detailed Solution for Organometallic Compounds - Question 5

For all Cp to similar environment all the CO should be in μ3- mode

Organometallic Compounds - Question 6

Bond lengths and angles have been determined by gas phase electron diffraction for two similar complexes, Fe(CO)4(C2H4)(X) and fe(CO)4(C2F4), (Y)

Which of the following statement is true

Detailed Solution for Organometallic Compounds - Question 6

As C2F4 is strong -acceptor than C2H4. Hence, there will be more backbonding in (Y). Hence, C–C bond will be larger and M–C bond will be shorter in Y.

Organometallic Compounds - Question 7

The solved state magic angle spinning 13C NMR spectrum of Fe(CO)5 shows a single absorption at –26ºC but two singnals at –118ºC with relative intensity

Detailed Solution for Organometallic Compounds - Question 7

At –118ºC movement of axial ligand to equatorial is slow. Hence, axial and equatorial ligands give different signal. Hence, intensity ratio will be 2 : 3

*Answer can only contain numeric values
Organometallic Compounds - Question 8

Total number of isolobal fragments are_______


Detailed Solution for Organometallic Compounds - Question 8

*Answer can only contain numeric values
Organometallic Compounds - Question 9

Considering the quadnipolar nature of M -M bond in [Re2CI8]2-, M -M bond order in [Re2Cl4(PMe2Ph)4]is ___________


Detailed Solution for Organometallic Compounds - Question 9

[Re2Cl4(PMe2Ph)4]+
Let the oxidation states of two Re atoms are x and y
x + y - 4 = + 1
x + y = +5 
x = +2, y = +3  

Therefore, total number of d-electrons on Re2+ and Re3* ions = 5 + 4 = 9 Electronic configuration in this cluster ion is

Bond order 

*Answer can only contain numeric values
Organometallic Compounds - Question 10

Following the 18e- rule as a guide, determine x in the following complex.


Detailed Solution for Organometallic Compounds - Question 10



Organometallic Compounds - Question 11

Which of the following statement is not true

Detailed Solution for Organometallic Compounds - Question 11

This reactions reductive elimination takes place first then followed by oxidative addition.

Organometallic Compounds - Question 12

The above reaction is an example of

Detailed Solution for Organometallic Compounds - Question 12

In above reaction CH2 get inserted  between two metal. Hence, reaction is an example of insertion reaction.

Organometallic Compounds - Question 13

Structures of Fe5(CO)15C and Os5(CO)16 respectively are

Detailed Solution for Organometallic Compounds - Question 13

Organometallic Compounds - Question 14


Correct set representing A and B respectively are

Detailed Solution for Organometallic Compounds - Question 14

Organometallic Compounds - Question 15

Detailed Solution for Organometallic Compounds - Question 15

 

Organometallic Compounds - Question 16

Consider the following reaction, 
Consider the correct statement regarding A and B
(1) complex A is diamagnetic in nature
(2) complex B contain one ligand in η4-mode
(3) A has smaller M-C bond length than 
(4) A has larger M-C bond length than 

Detailed Solution for Organometallic Compounds - Question 16


Complex A obey 18 electron, in Co(Cp)there is an electron in antibonding orbital which leads to increase in bond length. Hence, correct option is (2) and (3).

Organometallic Compounds - Question 17

Detailed Solution for Organometallic Compounds - Question 17

Grubbs catalyst used for ring closing metathesis of olefins.

*Answer can only contain numeric values
Organometallic Compounds - Question 18

The number of valence electrons provided by Co(CO)4 fragment towards cluster bonding is ___________


Detailed Solution for Organometallic Compounds - Question 18

Each transition metal has 12 electrons associated with it that are reserved for non-framework bonding. Electron more than 12 electrons are involved in cluster bonding.
Number of valence electron in Co(CO)4  =  17
Hence, number of electrons towards cluster bonding = 17–12 = 5

*Answer can only contain numeric values
Organometallic Compounds - Question 19

In the reaction shown below

Number of CO ligand in Y is_____


Detailed Solution for Organometallic Compounds - Question 19

*Answer can only contain numeric values
Organometallic Compounds - Question 20

The number of complexes having NO ligand in linear form are____.


Detailed Solution for Organometallic Compounds - Question 20


have no ligand in linear form.

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