IGNOU MCH 11 SOLVED ASSIGNMENT

Ques 1.

Explain the trends of ionization energy down the groups of the elements in the periodic table. How are the higher values of ionisation energies of the 5d transition elements justified?

Ques 2.

What is the trend of the stability of the +6 state for Group 6 elements like tungsten, molybdenum and chromium? Which other group show a similar trend? Justify your answer.

Ques 3.

 Explain the structure of the pentafluorotellurate(IV) anion with the help of VSEPR theory. What is the point group of the symmetry in it?

Ques 4.

With suitable illustration explain the theory of Dewar for π bonding in phosphazenes. What is phospham and how it is synthesized? Give suitable reaction.

Ques 5.

Give the classification of nonclassically bonded organometallic compounds.

Ques 6.

With any two suitable examples show how organanometallic complexes of different classes may be stabilized by bulky ligands.

Ques 7.

With suitable illustration explain the bent tin-tin double bond in (SnR2)2; where R = (Me3Si)2CH.

Ques 8.

With the help of suitable examples and structures, explain why some of the 16-electron organometallic complexes are stable. For a dⁿ metal ion which form will be more stable, 16-electron square planar complex (d⁸ and 8 ligand electrons) or a 18-electron complex (d⁸ and 10 ligand electrons)? Justify your answer.

Ques 9.

With suitable diagrams explain the electronic structure of NO and its binding to a metal fragment on the covalent model.

Ques 10.

Compare the characteristics of electron-rich phosphines with those of electron poor phosphines regarding their σ donor and π acceptor capacities. What happens to these characteristics when the average electronegativity of the three groups attached to P increases?

Ques 11.

Explain the π system of the allyl group with the help of molecular orbital theory. Illustrate your answer.

Ques 12.

Give the structure of titanocene with its IUPAC nomenclature. How is the Hund's rule obeyed in manganocene?

Ques 13.

Give the reactions for preparation of decaborane(14) from B₅H₈⁻ anion. Which is the only neutral dodecaborane and how is it prepared? Give suitable equation.

Ques 14.

 Explain the structure of MoCl₄²⁻. Which are the two main classes of metal atom cluster compounds?

Ques 15.

Give the electronic configuration of d⁸ and d⁹ complexes in both weak and strong fields. Also calculate their CFSE.

Ques 16.

Explain the structure of normal spinels with a suitable example. Give suitable illustration.

Ques 17.

Give suitable equations and explain the orbital and spin contributions towards paramagnetism in a complex.

Ques 18.

What is the expected magnetic moment of the complex MnF₃? What sort of stereochemistry is seen in it? What is the electron configuration in it based on crystal field theory.

Ques 19.

Write the Russell-Saunders terms symbols for states with the angular momentum quantum numbers (L,S) (a) (1, 1/2) (b) (2,1) (c) (0, 3/2) (d) (3, 0).

Ques 20.

Explain how the R- and S- labels are used for enantiomers. Explain the λ and δ conformations of methyl axial and methyl equatorial respectively. Give suitable illustrations for all of these.

Ques 21.

Explain the trends of ionization energy down the groups of the elements in the periodic table. How are the higher values of ionisation energies of the 5d transition elements justified?

Ques 22.

What is the trend of the stability of the +6 state for Group 6 elements like tungsten, molybdenum and chromium? Which other group show a similar trend? Justify your answer.

Ques 23.

 Explain the structure of the pentafluorotellurate(IV) anion with the help of VSEPR theory. What is the point group of the symmetry in it?

Ques 24.

With suitable illustration explain the theory of Dewar for π bonding in phosphazenes. What is phospham and how it is synthesized? Give suitable reaction.

Ques 25.

Give the classification of nonclassically bonded organometallic compounds.

Ques 26.

With any two suitable examples show how organanometallic complexes of different classes may be stabilized by bulky ligands.

Ques 27.

With suitable illustration explain the bent tin-tin double bond in (SnR2)2; where R = (Me3Si)2CH.

Ques 28.

With the help of suitable examples and structures, explain why some of the 16-electron organometallic complexes are stable. For a dⁿ metal ion which form will be more stable, 16-electron square planar complex (d⁸ and 8 ligand electrons) or a 18-electron complex (d⁸ and 10 ligand electrons)? Justify your answer.

Ques 29.

With suitable diagrams explain the electronic structure of NO and its binding to a metal fragment on the covalent model.

Ques 30.

Compare the characteristics of electron-rich phosphines with those of electron poor phosphines regarding their σ donor and π acceptor capacities. What happens to these characteristics when the average electronegativity of the three groups attached to P increases?

Ques 31.

Explain the π system of the allyl group with the help of molecular orbital theory. Illustrate your answer.

Ques 32.

Give the structure of titanocene with its IUPAC nomenclature. How is the Hund's rule obeyed in manganocene?

Ques 33.

Give the reactions for preparation of decaborane(14) from B₅H₈⁻ anion. Which is the only neutral dodecaborane and how is it prepared? Give suitable equation.

Ques 34.

 Explain the structure of MoCl₄²⁻. Which are the two main classes of metal atom cluster compounds?

Ques 35.

Give the electronic configuration of d⁸ and d⁹ complexes in both weak and strong fields. Also calculate their CFSE.

Ques 36.

Explain the structure of normal spinels with a suitable example. Give suitable illustration.

Ques 37.

Give suitable equations and explain the orbital and spin contributions towards paramagnetism in a complex.

Ques 38.

What is the expected magnetic moment of the complex MnF₃? What sort of stereochemistry is seen in it? What is the electron configuration in it based on crystal field theory.

Ques 39.

Write the Russell-Saunders terms symbols for states with the angular momentum quantum numbers (L,S) (a) (1, 1/2) (b) (2,1) (c) (0, 3/2) (d) (3, 0).

Ques 40.

Explain how the R- and S- labels are used for enantiomers. Explain the λ and δ conformations of methyl axial and methyl equatorial respectively. Give suitable illustrations for all of these.

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