ABC26IN1491 · The most stable vanadium species in aqueous medium is · DEC 2019
ABC26IN0285 · The order of rate of substitution of chloride by pyridine (in ethanol) in the following complexes is I II III · 2020
ABC26IN1496 · The order of rate of substitution of chloride by pyridine (in ethanol) in the following complexes is · DEC 2019
ABC26IN0286 · Among the following complexes, the one showing the highest rate of substitution of a CO ligand on heating with one equivalent of PPh3 in… · 2020
ABC26IN1497 · Among the following complexes, the one showing the highest rate of substitution of a CO ligand on heating with one equivalent of PPh3 in… · DEC 2019
ABC26IN1499 · On heating [Mo (N2 )2 (PMe2 Ph )4 ] and [ReCl (N2 ) (PMe2 Ph )4 ], the products formed are respectively · DEC 2019
ABC26IN0287 · The product A of the following reaction is conc. H2SO4 A Is · 2020
ABC26IN1502 · The number of peaks with relative intensities observed in the 1 H NMR spectra of [(Cp)2 Fe(CO)2 ] at +30 °C and - 80 °C in diethyl ether… · DEC 2019
ABC26IN1508 · The major product formed in the following reaction +\ PhMgBr\ [Pd(PPh3)4] · JUNE 2021
Organometallics – General
ABC26IN0749 · Metal-carbon multiple bonds in metal carbonyl are preferably identified from the stretching frequency of · 2005-2022
ABC26IN0750 · B2 H6 and B4 H10, respectively, are examples of · 2005-2022
ABC26IN0751 · Schematically represents orbital overlaps in metal carbonyls. Show the correct signs of the lobes. · 2005-2022self-practice
ABC26IN0752 · The Correct order of CO vibrational stretching frequency in the following complexes is (I) (PF3 )3 Mo(CO)3 (II) (PCl3 )3 Mo(CO)3 (III)… · 2005-2022
ABC26IN0753 · The carbonyl stretching frequency (vC=O ) is highest for: · 2005-2022
ABC26IN0754 · The correct order of M-C(M=Ti, V, Cr and Mn) bond stretching frequency is: (Given: Atomic number of Ti=22, V=23, Cr=24 and Mn=25 ) · 2005-2022
ABC26IN0755 · For the following reactions, the metal complexes X and Y are (i) Ni(s) [1 atm / 25 C]CO(g) X (ii) FeCl2 2 NaC5 H5 Y · 2005-2022
ABC26IN0756 · Which of the following statement(s) is/are true about the transition metal-alkene complexes? · 2005-2022self-practice
ABC26IN0757 · The value of 'x' in [Cu(CO)x ]+such that it obeys the 18 electron rule is · 2005-2022
ABC26IN0758 · The correct order of vNO (cm-1 ) in the following compound is · 2005-2022
ABC26IN0759 · The homogeneous catalyst used in water-gas shift reaction is · 2005-2022
ABC26IN0760 · Among the following metal carbonyl species, the one with the highest metal-carbon back bonding is · 2005-2022
ABC26IN0761 · The correct statement(s) about carbene is(are) · 2005-2022self-practice
ABC26IN0762 · The correct option having one complex from each of the following pairs which is more reactive towards the oxidative addition reaction by… · 2005-2022
ABC26IN0763 · The value of n for the complex [Fe(CO)4 (SiMe3 ) ]n satisfying the 18-electron rule is · 2005-2022self-practice
ABC26IN0764 · Number of vertices in an icosahedral closo-borane is ____. · 2005-2022
ABC26IN0765 · The order of the M-C bond strength in the following species is (Atomic number for Cr=24, Mn=25, Ti=22, Co=27 ) · 2005-2022
ABC26IN0766 · The cage - type structure adopted by boron hydride [B5 H11 ], is · 2005-2022self-practice
ABC26IN0767 · The complex which does NOT obey 18 - electron rule is (atomic number for Mn=25, Fe=26, Co=27, Ru=44 ) · 2005-2022
ABC26IN0768 · The organometallic reagent(s) among the following is(are) · 2005-2022self-practice
ABC26IN0769 · The CORRECT order of pKa for the compounds I to IV in water at 298 K is IHCo(CO)4 IIHCo(CO)3(PPh3) IIIHCo(CO)3(P(OPh)3) IVHCo(CO)2(PPh3)2 · 2005-2022
ABC26IN0770 · The complex that does NOT obey the 18-electron rule is (Given: Atomic numbers of Ti, Mn, Ta and Ir are 22, 25, 73 and 77, respectively) · 2005-2022
ABC26IN0771 · The decreasing order of C=C bond length in the following complexes is · 2005-2022
ABC26IN0772 · The CORRECT statement(s) about the species is (are) · 2005-2022self-practice
ABC26IN0773 · The structure types of B10 H10 2- and B10 H14, respectively, are · 2005-2022
ABC26IN0774 · The order of increasing CO stretching frequencies in [Co(CO)4 ]-, [Cu(CO)4 ]+, [Fe(CO)4 ]2- and [Ni(CO)4 ] is · 2005-2022
ABC26IN0775 · The number of CO stretching bands in the infrared spectrum of Fe(CO)5 is · 2005-2022
ABC26IN0776 · The reaction involve(s) · 2005-2022self-practice
Oxidative Addition Reductive Elimination
ABC26IN0225 · The oxidative addition and reductive elimination steps are favoured by · JUNE 2011
ABC26IN1342 · The oxidative addition and reductive elimination steps are favoured by · JUNE 2011
ABC26IN1355 · The greater stability of ( (CH3 )3 C-CH2 - )4 Ti(A) compared to that of ( (CH3 )2 CH-CH2 - )4 Ti(B) is due to · DEC 2011
ABC26IN1370 · Consider the following reaction mechanism The steps A, B and C, respectively, are · DEC 2012
ABC26IN1371 · Which one of the following will NOT undergo oxidative addition by methyl iodide? · DEC 2012
ABC26IN0235 · In hydrofomylation reaction using [Rh(PPh3)2(CO)(H)] as the catalyst, addition of excess PPh3, would · DEC 2012
ABC26IN1372 · In hydrofomylation reaction using [Rh (PPh3 )2(CO)(H) ] as the catalyst, addition of excess PPh3, would · DEC 2012
ABC26IN0236 · Reactions A and B are, termed as respectively. (A) + (B) + + · DEC 2012
ABC26IN1373 · Reactions A and B are, termed as respectively. · DEC 2012
ABC26IN1375 · The reaction, [(CO)5 Mn(Me) ]+CO [(CO)5 Mn\C(O) Me\ ] is an example for · JUNE 2013
ABC26IN1390 · The typical electronic configurations of the transition metal centre for oxidative addition · JUNE 2014
ABC26IN1401 · Reductive elimination step in hydrogenation of alkenes by Wilkinson catalyst results in (neglecting solvent in coordination sphere of Rh) · DEC 2014
ABC26IN1403 · The compound that undergoes oxidative addition reaction in presence of H2, is · DEC 2014