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Organic Chemistry Questions and Answers – Organometallic Compounds – 2 | Organic Chemistry Multiple Choice Questions and Answers

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(1) Which of the following statement is not true about ferrocene?
[A] decamethyl ferrocene is staggered in solid state
[B] cyclopentadienyl rings in ferrocene are almost eclipsed
[C] cyclopentadienyl ring in ferrocene are staggered
[D] ferrocene can be nitrated by reaction with dil. HNO3
Answer: cyclopentadienyl ring in ferrocene are staggered
(2) Ferrocene cannot undergo which of the following reaction?
[A] Friedal craft acylation
[B] Diels-Alder reaction
[C] Oxidation by Ag + ions
[D] Electrophilic substitution
Answer: Diels-Alder reaction

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(3) Structurally nickelocene is similar to ferrocene but how Nickelocene attains stability?
[A] due to formation of a monocation
[B] due to formation of a dication
[C] due to formation of a monoanion
[D] due to formation of a dianion
Answer: due to formation of a dication
(4) Which of the following is/are true about ferrocene?

I. Ferrocene is diamagnetic

II. Dipole moment is zero

III. Kealy and Pauson synthesizes ferrocene from C5H5 and freshly reduced Fe at 300℃

IV. Kealy and Pauson synthesises ferrocene from C5H5MgBr and FeCl3.

[A] III and IV
[B] I, II and III only
[C] I, II and IV only
[D] II, III and IV only
Answer: I, II and III only
(5) Which type of boranes are B5H9 and B4H10 respectively?
[A] Nido and Arachano boranes
[B] Nido and closo boranes
[C] Closo and Arachano boranes
[D] Both are Nido
Answer: Nido and Arachano boranes
(6) Mn(CO)5 is isolobal with which of the following compound?
[A] CH4
[B] CH3
[C] CH2
[D] CH
Answer: CH
(7) Which of following pair is not isolobal?
[A] Mn(CO)5, CH3
[B] [Fe(CO)4], O
[C] Mn(CO)5, Cl
[D] Mn(CO)5, O
Answer: Mn(CO)5, O
(8) According to wade’s Rule, [C2B10H12] adopts which type of structure?
[A] closo structure
[B] nido structure
[C] archano structure
[D] hypo structure
Answer: closo structure
(9) Which property is the same for isolobal molecules?
[A] e– capture
[B] Boiling point
[C] Melting point
[D] Solubility
Answer: e– capture
(10) Which of the following is not considered as an organometallic compound?
[A] Ferrocene
[B] Cis-platin
[C] Ziese’s salt
[D] Grignard reagent
Answer: Cis-platin

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