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Test: Organometallic Chemistry- 1


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20 Questions MCQ Test Inorganic Chemistry | Test: Organometallic Chemistry- 1

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Test: Organometallic Chemistry- 1 - Question 1

In Ziegler-Natta catalysis the commonly used catalyst system is:

Test: Organometallic Chemistry- 1 - Question 2

The substitution of η5-Cp group with nitric oxide is the easiest for:

Detailed Solution for Test: Organometallic Chemistry- 1 - Question 2

Test: Organometallic Chemistry- 1 - Question 3

Among the following, the unstable carbonyl species is:

Test: Organometallic Chemistry- 1 - Question 4

Oxidation number of Co in [Co(NO)(CO)3] is:

Test: Organometallic Chemistry- 1 - Question 5

The organometallic compound W(C5H5)2(CO)2 follows the 18-electron rule, The hapticities of the two cyclopentadienyl groups are:

Detailed Solution for Test: Organometallic Chemistry- 1 - Question 5

W is 6 electron species while CO will give 2 electrons

So, 1W + 2(CO) = 10 electrons. 

Remaining 8 electrons will be coming from 2Cp. 

Hapticity means no of electrons donated by the ligand.

Here 5 + 3 = 8. So one Cp = 5 

Hapticity One Cp = 3 

Hapticity Total 1 W + 2 (CO) + 1 ( Cp-5) + 1 (Cp-3) 

= 6+4+5+3 

= 18

Therefore, correct answer is B.

Test: Organometallic Chemistry- 1 - Question 6

For a square planar complex [Mabcd] (where M = central metal and abcd are monodentate ligands), the number of possible geometrical isomers are:

Test: Organometallic Chemistry- 1 - Question 7

Which of the following will exhibit optical isomerism:

Test: Organometallic Chemistry- 1 - Question 8

The compounds [PtCl2(NH3)4]Br2 and [PtBr2(NH3)4]Cl2 constitutes a pair of:

Test: Organometallic Chemistry- 1 - Question 9

The order of CO bond strengths in the following metal hexacarbonyls is likely to be:

Detailed Solution for Test: Organometallic Chemistry- 1 - Question 9
  • In the isoelectronic series of metal carbonyl, the CO bond strength is expected to increase in the order [V(CO)-6]< [Cr(CO)6]< [Mn(CO)+6]
  • The oxidation state of the central metal atom increases in the order V(−) < Cr(0) < Mn(+) .
  • As the oxidation state of the central metal atom increases, less and less electron density is donated to the carbonyl ligand.
  • This increases the CO bond strength as the added electron density occupies the anti-bonding orbital.
Test: Organometallic Chemistry- 1 - Question 10

How many M — M bonds are present in [Cp Mo(CO3)]2?

Detailed Solution for Test: Organometallic Chemistry- 1 - Question 10

Cyclopentadienylmolybdenum tricarbonyl dimer is the chemical compound with the formula Cp2Mo2(CO)6, where Cp is C5H5.

No. of M-M bonds = (18×2-[(6+5+2×3)×2])/2=0.9 ~ 1

Cyclopentadienylmolybdenum tricarbonyl dimer - Wikipedia

Test: Organometallic Chemistry- 1 - Question 11

Which of the following complex is in which organic ligand is having only bond with metal? 

Detailed Solution for Test: Organometallic Chemistry- 1 - Question 11

CH3 is the only σ-donor ligand while C2H4, C5H5, C6H6 are π-acceptor ligands.

Test: Organometallic Chemistry- 1 - Question 12

Solid Co2(CO)8 shows infrared CO stretching bands at 1857, 1886, 2001, 2031, 2044, 2059, 2071 and 2112 cm–1. When Co2(CO)8 is dissolved in hexane, the carbonyl bands at 1857 and 1886 cm–1 disappear. These changes in the infrared spectrum in hexane are due to:

Test: Organometallic Chemistry- 1 - Question 13

Which one of the following specie will be most easily reduced:

Test: Organometallic Chemistry- 1 - Question 14

The final product in the reaction 

[Mn (CO)6]-  + MeLi → is :

Test: Organometallic Chemistry- 1 - Question 15

In the complex, [Ni2(η5-Cp)2(CO)2] the IR stretching frequency appears at 1857 cm-1 (strong) and 1897 cm-1 (weak). The valence electron count and the nature of the M—CO bond respectively are:

Test: Organometallic Chemistry- 1 - Question 16

Amongst the following, the metal that does not form homoleptic polynuclear metal carbonyl is:

Test: Organometallic Chemistry- 1 - Question 17

Complexes of general formula, fac–[Mo(CO)3(Phosphine)3] have the C—O stretching frequency bands as given below,
Phosphines: PF3 (P), PCl3 (Q), P(Cl)Ph2 (R), PMe3(S)
ΝCO, cm–1 : 2090 (I); 2040 (II); 1977 (III); 1945 (IV)

Test: Organometallic Chemistry- 1 - Question 18

What kind of isomerism is exhibited by octahedral [Co(NH3)4Br2]Cl:

Test: Organometallic Chemistry- 1 - Question 19

In which of the following pairs, both the complexes show optical isomerism:

Test: Organometallic Chemistry- 1 - Question 20

The ionization isomer of [Cr(H2O)4Cl(NO2)]Cl is :

Detailed Solution for Test: Organometallic Chemistry- 1 - Question 20

The ionization isomer of [Cr(H2O)4Cl(NO2)]Cl is [Cr(H2O)4Cl2](NO2)

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