Oragnometallic complexes of Lanthnoids and actinoids

In the solid state, [Nd{N(SiMe₃)₂}₃ exist as:

a.      trigonal pyramidal

b.     trigonal planar

c.      angular

d.     T-shaped

• a

• b

• c

• d

In contrast to the extensive carbonyl chemistry of the d-block metals, lanthanoid metals do not form complexes with CO under normal conditions because

a.      Absence of unpaired electron

b.     unable to engage in sigma bond formation

c.      Unable to form bridging between CO and metal

d.     unable to form p-back bonding

• a

• b

• c

• d

• a

• b

• c

• d

The pair of lanthanoid complexes exist as monomeric:

a.      Cp₃Pr and Cp₃Lu

b.     Cp₃La and Cp₃Yb

c.      Cp₃Tm and Cp₃Lu

d.     Cp₃Tm and Cp₃Yb

• a

• b

• c

• d

(ŋ⁵-C₅H₅)₂DyCl exist as

a.      Monomeric

b.     Dimeric

c.      Polymeric

d.     Trimeric

• a

• b

• c

• d

The colour of [Cp]4Th complex is:

a. Red

b. Green

c. Colorless

d. Brown

• a

• b

• c

• d

cyclopentadienyl complexes of Th(III) and U(IV) are respectively,

a. Covalent and covalent

b. Covalent and ionic

c. Ionic and ionic

d. Ionic and covalent

• a

• b

• c

• d

Consider the statements and select the correct option:

I - Uranocene is flammable in air and is moisture sensitive

II- Thorocene is air-sensitive, is attacked by protic reagents and explodes when red hot.

a. I is correct, II is incorrect

b. Both I and II are correct

c. I is incorrect and II is correct

d. Both incorrect

• a

• b

• c

• d

Which statement is incorrect for [Cp4U] complex

a. It is monomeric

b. It is colorless

c. It is a red colored complex

d. Its structure is distorted tetrahedral

• a

• b

• c

• d

The color of the complexes, uranocene and thorocene is respectively,

a.      Yellow and green

b.     Red and green

c.      Red and yellow

d.     Green and yellow

• a

• b

• c

• d