Organometallic compounds

Organometallic compounds: synthesis, bonding and structure, and reactivity. Organometallics in homogeneous catalysis.

YEAR JUN-2016 DEC-2015 JUN-2015 DEC-2014 JUN-2014 DEC-2013 JUN-2013 DEC-2012 JUN-2012 DEC-2011 JUN-2011
No.of questions appeared  8 8 11 10 5 10 12 10 10 8 7

1.The reactions of Ni(CO)4with the ligand (L = PMe3or P(OMe)3)L yields 3 Ni(CO)3L . The reaction is

(a) Associative

(b) Dissociative

(c) Interchange (Ia)

(d) Interchange (Id)

 

2.The correct statement for the aggregating nature of alkyl lithium (RLi) reagent is:

(a) The carbanionnucleophilicity increases with aggregation.

(b) The observed aggregation arises from its electron deficient nature.

(c) Carbanionnucleophilicity does not depend on aggregation.

(d) The extent of aggregation is maximum in polar dative solvents.

 

3.For the reaction, trans-[IrCl (CO) (PPh3)2] + Cl2→ trans-[IrCl3(CO) (PPh3)2], the correct observation

(a) VCO(product) > VCO(reactant)

(b) VCO(product) < VCO(reactant)

(c) VCO(product) = VCO(reactant)

(d) VCO(product) = VCO(free CO)

 

4.The nucleophilic attack on olefins under mild conditions:

 (a) Is always facile

(b) Is more facile than electrophilic attack on olefins

(c) Is facile for electron-rich olefins

(d) Requires activation by coordination to metal.

 

5.The cluster having arachno type structure is:

(a) Os5(CO)16

(b) Os3(CO)12

(c) Ir4(CO)12

(d) Rh6(CO)16

 

6.The carbonyl resonance in 13C NMR spectrum of [(h5– C5 H5)Rh(CO)]3 (103Rh, nuclear spin, I=1/2, 100%) shows a triplet at –65º C owing to the presence of

(a) Terminal CO

(b) μ2– CO

(c) μ3  CO

(d) η5-C5H5

 

 

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