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

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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(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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