21.

The alkene that exhibits geometrical isomerism is

• propene

• 2-methyl propene

• 2-butene

• 2-butene

Which of the following has an optical isomer ?

• [CO(NH₃)₃Cl]⁺

• [CO(en)(NH₃)₂]²⁺

• [CO(H₂O)(en)]³⁺

• [CO(H₂O)(en)]³⁺

The number of stereoisomers possible for a compound of the molecular formula CH₃-CH =CH-(OH)-Me is

• 3

• 2

• 4

• 4

Which of the following pairs represents linkage isomers?

• [Cu(NH₃)₄][PtCl₄] and [Pt(NH₃)₄][CuCl₄]

• [Pd(PPh₃)₂(NCS)₂] and [Pd(PPh₃)₂(SCN)₂]

• [CO(NH₃)₅NO₃]SO₄ and [CO(NH₃)₅SO₄]NO₃

• [CO(NH₃)₅NO₃]SO₄ and [CO(NH₃)₅SO₄]NO₃

The coordination number and the oxidation state of the element ‘E’ in the complex [E(en)₂(C₂O₄)]NO2 (where(en) is ethylene diamine) are, respectively,

• 6 and 2

• 4 and 2

• 4 and 3

• 4 and 3

In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of ∆o be the highest?

• [Co(CN)₆]³⁻

• [Co(C₂O₄)₃]³⁻

• [Co(H₂O)₆]³⁺

• [Co(H₂O)₆]³⁺

The absolute configuration of 

• S,S

• R,R

• R,S

• R,S

Which one of the following has a square planar geometry?

• [CoCl₄]^2-

• [FeCl₄]^2–

• [NiCl₄] ^2–

• [NiCl₄] ^2–

Which of the following molecules is expected to rotate the plane of plane-polarised light?

In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed?

• C₂ → C₂⁺

• NO → NO⁺

• O₂ → O₂⁺
  

• O₂ → O₂⁺