Organic Chemistry Questions and Answers – Organometallic Compounds – 1 | Organic Chemistry Multiple Choice Questions and Answers

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Questions
1 What are oxidation states of metal ion in following complexes?

I. PdCl2

II. Pd(PPh3)4

III. Pd(OAc)2

IV. ArPdBr where Ar is aryl

A 2, 4, 2, 2
B 2, 0, 2, 1
C 2, 0, 2, 2
D 0, 0, 0, 2

Answer: 2, 0, 2, 2
2 Which of the following complex has a highest oxidation state of metal?
A (η6-C6H6)2Cr
B Mn(CO)5Cl
C Na2[Fe(CO)4]
D K[Mn(CO)5]

Answer: Na2[Fe(CO)4]
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3 Which of the following complex is in which organic ligand is having only bond with metal?
A W(CH3)6
B K[PtCl3(C2H4)]
C (η5-C5H5)2Fe
D (η5-C6H6)2Ru

Answer: W(CH3)6
4 What is the oxidation state of molybdenum in [η7-tropylium) Mo(CO)3]+?
A +2
B +1
C 0
D -1

Answer: 0
5 Which of the following is the neutral complex which follows the 18- electron rule?
A (η5-C5H5)Fe(CO)2
B  (η5-C5H5)2Mo(CO)3
C (η5-C5H5)2Co
D (η5-C5H5)2Re(η6-C6H6)

Answer: (η5-C5H5)2Re(η6-C6H6)
6 If complex [W(Cp)2(CO)2] follows 18e- rule. What is Hapticity of Cp?
A 5 and 5
B 3 and 5
C 3 and 3
D 1 and 5

Answer: 3 and 5
7 Which of the following complexes show easy oxidation?
A (η5-C5H5)2Fe
B (η5-C5H5)2Ru
C (η5-C5H5)2Co
D (η5-C5H5)2Co+

Answer: (η5-C5H5)2Co
8 How many M — M bonds are present in [Cp Mo(CO3)]2?
A 1
B 2
C 0
D 4

Answer: 0
9 Which of the following is the incorrect statement about Zeise’s salt?
A Zeise’s salt is diamagnetic
B Oxidation state of Pt in Zeis’s salt is +2
C All the Pt-Cl bond length in Zeise’s salt are equal
D C-C bond length of ethylene moiety in Zeise’s salt longer than that of free ethylene molecule

Answer: All the Pt-Cl bond length in Zeise’s salt are equal
10 For metal olefin complexes (i) [PtCl3(C2F4)]– and (ii) [PtCl3(C2H4)]–, which of the following is the correct statement?
A carbon-carbon bond length is same both in (i) and (ii)
B carbon-carbon bond length in (i) is smaller
C carbon-carbon bond length in (ii) is smaller
D a metallacycle is formed in each complex

Answer: carbon-carbon bond length in (i) is smaller
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