IGNOU MSCANCHEM MCH 17 SOLVED ASSIGNMENT

Included:

MCH 017 (July 2025) - ENGLISH

Tutor Marked Assignment Organic Chemistry-II

Course Code: MCH-017

Assignment Code: MCH-017/TMA/2025

Maximum Marks: 100

Note: Attempt all the questions. The marks for each question are indicated against it.

1. (a) Write the names of the following compounds according to Hantzsch-Widman system of nomenclature.

(b) Write the structures of the following compounds:

(i) Pyrazino [2, 3,-c] pyridazine

(ii) 2-Methylazacyclohexane

(iii) 2,5-Diazaanthracene

2. (a) List the important bands observed in the UV spectra of the following compounds.

(i) Pyridazine

(ii) Pyrazine

(b) Explain the chemical shift values exhibited in the 'H-NMR spectrum of pyridine.

3. Discuss how can tetraalkylaziridines be synthesised.

4. Give the products of the reaction of azetedine with the following reagents:

(i) RCOCI

(ii) CS2

(iii) HNO2

(iv) HCHO

(v)HCI/A

5. Illustrate giving two [3+2] cycloaddition reactions how can 1,3-dipolar compounds react with alkenes and alkynes to give pyrazoles.

6. Discuss Bischer synthesis of indole. How can you obtain a single product in this reaction?  

7. How can benzotriazole be synthesised starting from ortho-phenylenediamine? Give the mechanism of the reaction.

8. Discuss the Skraup synthesis of quinoline giving the reactions involved.

9. Draw the taustomeric forms of azepines and compare their stabilities.

10. Explain the synthesis of azepine using ethoxycarbonyl nitrene.

11. Discuss the disconnections for the synthesis of benzocaine.

12. Explain Negishi coupling reaction with an example and give its mechanism.

13. Explain giving suitable reactions the reduction of benzene using sodium is liquid ammonia.

14. Give examples of alkoxysubstituted LAH reducing agents. Compare their selectivity with LAH.

15. Discuss the oxidation of monoalkylacetylenes using thalium nitrate. Also give the mechanism of the reaction.

16. Write various factors which control the formation of enolates.

17. What are homoenolates? Write the methods of their preparation.

18. Discuss the role of phase transfer catalysis in nucleophilic substitution reactions.

19. Write the advantages and disadvantages of chiron approach.

20. With suitable examples, discuss the control of enantioselectivity in alkylation reactions.

MCH 17 2026 - English

Tutor Marked Assignment Organic Chemistry-II

Course Code: MCH-017

Assignment Code: MCH-017/TMA/2026

Maximum Marks: 100

Note: Attempt all the questions. The marks for each question are indicated against it.

1. Write the names of the following compounds

(b) Write the structures: 

(i) Carbazole

(ii) Pyrizino [2,3-d] pyridazine

(iii) 3-Methylazacyclohexane

2. How many signals will appear in the ¹H-NMR of the following compounds?

Also give their chemical shift values.

3. Give the oxiranes formed by the epoxidation reactions of cis- and trans-2-butenes. Also write the mechanism of this reaction.

4. Discuss any two methods of preparation of oxetanes giving suitable examples.

5. How can you obtain imidazoles using the following methods?

(i) Maquene synthesis

(ii) Bredereck reaction

6. (a) Give the products of the following reactions:

(i) Vilsmeier-Haack reaction of benzofuran

(ii) Nitration of benzothiophene

(iii) Chlorination of benzothiophene

(b) Which position of indole is preferred for electrophilic substitution reaction of indole and why?

7. (a) Give the products formed when

(i) Benzimidazole reacts with acrylonitrile

(ii) Benzimidazole reacts with formaldehyde

(iii) Benzotriazole is nitrated

(b) Describe the uses of benzotrioles.

8. (a) How did Emil Fischer synthesise purine? Give the sequence of reactions.

(b) Give any two examples of synthetic antimalarial drugs with structure wherein a quinoline moiety is present.

9. Draw the products of the following:

(i) Reduction of quinoline with different reagents.

(ii) Oxidative cleavage of quinoline

(iii) Bromination of quinoline

10. ( a) How can you synthesis oxepine from the following:

(i) [2,2,0] hexa-2,5-diene

(ii) 1,4- cyclohexadiene

(b) Give the product of reaction of oxepine with maleic anhydride.

11. Discuss the disconnections for the synthesis of paracetamol. Also write its scheme of synthesis. Draw the general scheme/mechanism of Stille coupling reaction. Give examples of some additives which are used to increase the rate of these reactions.

12. Explain using suitable diagram the mechanism of catalytic hydrogenation of an alkene.

13. What is Lindlar's catalyst? Give the products of reaction of mandelic acid and naphthalene using hydrogenation.

14. What is DIBAL? Give the method of its preparation. Which groups can be reduced using this reagent? Give any three examples of the compound which can be reduced using DIBAL.

15. Write the structures and the preparation of the following:

(i) Disimylborane

(ii) Thexylborane

(iii) 9-BBN

Give the products of reduction of 4-methylpent-2-ene with the above boranes.

16. Give a general reaction of asymmetric 1, 2-aminohydroxylation of alkenes using (DHQ)2-PHAL AD catalyst in the presence of (TsNCINa). Also give various nitrene equivalents which are frequently as reagents in this reaction.

17. Discuss the sequence of reactions for preparing the following compound using ethylaceoacetate

18. Discuss umpolung formation with dithiane. Give the reaction of 1,3-dithiane anion with ethanal and cyclohexanone.

19. Giving suitable examples discuss the use of phase transfer catalysts in the following reactions:

(i) Alkylation

(ii) Oxidation

(iii) Heck reaction

(iv) Wittig reaction

(v) Aldol and related reactions

20. What are stereospecific reactions? Briefly discuss any two of their examples.

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