IGNOU MCH 12 SOLVED ASSIGNMENT

Ques 1.

Carry out the following conversions as indicated.

a) Fischer form to: i) Staggered and Eclipsed Sawhorse forms and

ii) Staggered and Eclipsed Newman forms

b) Flying wedge form to Fischer forms

Ques 2.

Suppose that there is a mixture having a specific rotation of +75^o and an enantiomeric excess of 60%. Find out the enantiomeric composition of the mixture. 

Ques 3.

Draw the meso isomers of the following compounds.

Ques 4.

List the properties of diastereomers. Indicate whether the following are enantiomers or diastereomers.

Ques 5.

How are disubstituted cyclohexanes different from monosubstituted cyclohexanes with reference to the isomerism? Draw the two chair conformations for each of the following disubstituted cyclohexanes. Draw also the cis and trans isomers and indicate the more stable isomer.

i) cis-Bromo-1-methylcyclohexane

ii) trans-2-Butyl-1-isopropylcyclohexane

iii) cis-4-Ethyl-1-hydroxycyclohexane

Ques 6.

What are the advantages and limitations of method of quasi-racemates?

Ques 7.

What is pseudoasymmetry? Explain with the help of a suitable example.

Ques 8.

What are left- and right- circularly polarised lights? Draw suitable diagrams for them.

Ques 9.

Give any two applications of ORD and CD.

Ques 10.

What is the principle of microscopic reversibility? Explain taking the example of an addition-elimination reaction or a nucleophilic substitution reaction.

Ques 11.

Select the resonance stabilised cation and give reason for your answer.

Ques 12.

Write the product formed and give the mechanism.

Ques 13.

Does a carbanion behave as an acid or a base? Explain the stability of carbanion on the basis of this behaviour?

Ques 14.

Arrange the following anions in the decreasing order of stability.

Ques 15.

Predict the product and write the mechanism.

Ques 16.

Arrange the following radicals in their increase order of stability and give the reason of your answer.

Ques 17.

Write the products formed in each of the following and give the mechanism.

Ques 18.

Carry out the following conversions as indicated.

a) Fischer form to: i) Staggered and Eclipsed Sawhorse forms and

ii) Staggered and Eclipsed Newman forms

b) Flying wedge form to Fischer forms

Ques 19.

Suppose that there is a mixture having a specific rotation of +75^o and an enantiomeric excess of 60%. Find out the enantiomeric composition of the mixture. 

Ques 20.

Draw the meso isomers of the following compounds.

Ques 21.

List the properties of diastereomers. Indicate whether the following are enantiomers or diastereomers.

Ques 22.

How are disubstituted cyclohexanes different from monosubstituted cyclohexanes with reference to the isomerism? Draw the two chair conformations for each of the following disubstituted cyclohexanes. Draw also the cis and trans isomers and indicate the more stable isomer.

i) cis-Bromo-1-methylcyclohexane

ii) trans-2-Butyl-1-isopropylcyclohexane

iii) cis-4-Ethyl-1-hydroxycyclohexane

Ques 23.

What are the advantages and limitations of method of quasi-racemates?

Ques 24.

What is pseudoasymmetry? Explain with the help of a suitable example.

Ques 25.

What are left- and right- circularly polarised lights? Draw suitable diagrams for them.

Ques 26.

Give any two applications of ORD and CD.

Ques 27.

What is the principle of microscopic reversibility? Explain taking the example of an addition-elimination reaction or a nucleophilic substitution reaction.

Ques 28.

Select the resonance stabilised cation and give reason for your answer.

Ques 29.

Write the product formed and give the mechanism.

Ques 30.

Does a carbanion behave as an acid or a base? Explain the stability of carbanion on the basis of this behaviour?

Ques 31.

Arrange the following anions in the decreasing order of stability.

Ques 32.

Predict the product and write the mechanism.

Ques 33.

Arrange the following radicals in their increase order of stability and give the reason of your answer.

Ques 34.

Write the products formed in each of the following and give the mechanism.

Ques 35.

Carry out the following conversions as indicated.

a) Fischer form to: i) Staggered and Eclipsed Sawhorse forms and

ii) Staggered and Eclipsed Newman forms

b) Flying wedge form to Fischer forms

Ques 36.

Suppose that there is a mixture having a specific rotation of +75^o and an enantiomeric excess of 60%. Find out the enantiomeric composition of the mixture. 

Ques 37.

Draw the meso isomers of the following compounds.

Ques 38.

List the properties of diastereomers. Indicate whether the following are enantiomers or diastereomers.

Ques 39.

How are disubstituted cyclohexanes different from monosubstituted cyclohexanes with reference to the isomerism? Draw the two chair conformations for each of the following disubstituted cyclohexanes. Draw also the cis and trans isomers and indicate the more stable isomer.

i) cis-Bromo-1-methylcyclohexane

ii) trans-2-Butyl-1-isopropylcyclohexane

iii) cis-4-Ethyl-1-hydroxycyclohexane

Ques 40.

What are the advantages and limitations of method of quasi-racemates?

Ques 41.

What is pseudoasymmetry? Explain with the help of a suitable example.

Ques 42.

What are left- and right- circularly polarised lights? Draw suitable diagrams for them.

Ques 43.

Give any two applications of ORD and CD.

Ques 44.

What is the principle of microscopic reversibility? Explain taking the example of an addition-elimination reaction or a nucleophilic substitution reaction.

Ques 45.

Select the resonance stabilised cation and give reason for your answer.

Ques 46.

Write the product formed and give the mechanism.

Ques 47.

Does a carbanion behave as an acid or a base? Explain the stability of carbanion on the basis of this behaviour?

Ques 48.

Arrange the following anions in the decreasing order of stability.

Ques 49.

Predict the product and write the mechanism.

Ques 50.

Arrange the following radicals in their increase order of stability and give the reason of your answer.

Ques 51.

Write the products formed in each of the following and give the mechanism.

Ques 52.

Carry out the following conversions as indicated.

a) Fischer form to: i) Staggered and Eclipsed Sawhorse forms and

ii) Staggered and Eclipsed Newman forms

b) Flying wedge form to Fischer forms

Ques 53.

Suppose that there is a mixture having a specific rotation of +75^o and an enantiomeric excess of 60%. Find out the enantiomeric composition of the mixture. 

Ques 54.

Draw the meso isomers of the following compounds.

Ques 55.

List the properties of diastereomers. Indicate whether the following are enantiomers or diastereomers.

Ques 56.

How are disubstituted cyclohexanes different from monosubstituted cyclohexanes with reference to the isomerism? Draw the two chair conformations for each of the following disubstituted cyclohexanes. Draw also the cis and trans isomers and indicate the more stable isomer.

i) cis-Bromo-1-methylcyclohexane

ii) trans-2-Butyl-1-isopropylcyclohexane

iii) cis-4-Ethyl-1-hydroxycyclohexane

Ques 57.

What are the advantages and limitations of method of quasi-racemates?

Ques 58.

What is pseudoasymmetry? Explain with the help of a suitable example.

Ques 59.

What are left- and right- circularly polarised lights? Draw suitable diagrams for them.

Ques 60.

Give any two applications of ORD and CD.

Ques 61.

What is the principle of microscopic reversibility? Explain taking the example of an addition-elimination reaction or a nucleophilic substitution reaction.

Ques 62.

Select the resonance stabilised cation and give reason for your answer.

Ques 63.

Write the product formed and give the mechanism.

Ques 64.

Does a carbanion behave as an acid or a base? Explain the stability of carbanion on the basis of this behaviour?

Ques 65.

Arrange the following anions in the decreasing order of stability.

Ques 66.

Predict the product and write the mechanism.

Ques 67.

Arrange the following radicals in their increase order of stability and give the reason of your answer.

Ques 68.

Write the products formed in each of the following and give the mechanism.

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