Organic Compound -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

• 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

• 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

• What is the oxidation state of molybdenum in *η7 tropylium) Mo(CO)3]+? a) +2 b) +1 c) 0 d) -1

• 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)

• 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

• Which of the following complexes show easy oxidation? a) (η5-C5H5)2Fe b) (η5-C5H5)2Ru c) (η5-C5H5)2Co d) (η5-C5H5)2Co+

• How many M — M bonds are present in [Cp Mo(CO3)]2? a) 1 b) 2 c) 0 d) 4

• 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

• 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

• 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

• Ferrocene cannot undergo which of the following reaction? a) Friedal craft acylation c) cyclopentadienyl ring in ferrocene are staggered c) Oxidation by Ag + ions d) Electrophilic substitution

• 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

• 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 C5H5and freshly reduced Fe at 300℃ IV. Kealy and Pauson synthesises ferrocene from C5H5MgBr and FeCl3. The correct answer is: a) III and IV b) I, II and III only c) I, II and IV only d) II, III and IV only

• Which type of boranes are B5H9 and B4H10respectively? a) Nido and Arachano boranes b) Nido and closo boranes c) Closo and Arachano boranes d) Both are Nido

• Mn(CO)5 is isolobal with which of the following compound? a) CH4 b) CH3 c) CH2 d) CH

• 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

• According to wade’s Rule, *C2B10H12] adopts which type of structure? a) closo structure b) nido structure c) archano structure d) hypo structure

• Which property is the same for isolobal molecules? a) e– capture b) Boiling point c) Melting point d) Solubility

• Which of the following is not considered as an organometallic compound? a) Ferrocene b) Cis-platin c) Ziese’s salt d) Grignard reagent

• The fact that the fluorescence wavelength is often much longer than the irradiation wavelength (Stokes shift) is a consequence of which phenomenon? a) low extinction coefficients (Lambert-Beer law) b) vertical transitions (Kasha’s rule) c) high ISC rates (El Sayed rule) d) the Franck–Condon principle

• Which of the following is an incorrect statement? a) First step in photochemistry is excited state (photoexcitation) b) Photochemical reactions are caused by absorption of ultraviolet only c) When a molecule or atom in the ground state (S0) absorbs light, one electron is excited to a higher orbital level d) it is possible for the excited state S1 to undergo spin inversion

• Which regions of the light radiations of the visible ultraviolet lying between – wavelength are chiefly concerned in bringing about photochemical reactions? a) 1000 Å and 2000 Å b) 1500 Å and 1000 Å c) 8000 Å and 2000 Å d) 19000 Å and 12,000 Å

• Which of the following instruments is used to measure the energy of the monochromatic radiation most accurately? a) Photoelectric cell b) Thermopile c) The potential detector d) The chemical actinometer