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CHE 6: Organic Reaction Mechanism

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Title Name IGNOU CHE 6 SOLVED ASSIGNMENT
Type Soft Copy (E-Assignment) .pdf
University IGNOU
Degree BACHELOR DEGREE PROGRAMMES
Course Code BSC
Course Name Bachelor in Science
Subject Code CHE 6
Subject Name Organic Reaction Mechanism
Year 2025
Session -
Language English Medium
Assignment Code CHE 6/Assignment-1/2025
Product Description Assignment of BSC (Bachelor in Science) 2025. Latest CHE 06 2025 Solved Assignment Solutions
Last Date of IGNOU Assignment Submission Last Date of Submission of IGNOU BEGC-131 (BAG) 2025-26 Assignment is for January 2026 Session: 30th September, 2026 (for December 2025 Term End Exam).

Semester Wise
January 2025 Session: 30th March, 2026 (for June 2026 Term End Exam).
July 2025 Session: 30th September, 2025 (for December 2025 Term End Exam).
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CHE 6 2025 - English

Tutor Marked Assignment

CHE-06: Organic Chemistry

Course Code: CHE-06

Assignment Code: CHE-06/TMA/2025 Maximum

Marks: 100

Note: * This assignment is based on all the four Blocks of the entire course. * All questions are compulsory. Marks for the questions are shown within brackets on the right hand side. * Please answer in your own words; do not copy from the course material.

1. a) List the factors that are responsible for the relative strength of nucleophiles. Write the conjugate acids of the following nucleophiles.

R3N, RCHCN- , -NH2, Br-, CH3CH2O-

b) Categorise the following reactions as oxidation or reduction reaction indicating the oxidation state of carbon in the reactants and the products for all the reactions:

Image ignouassignments-ignouacademy-com-ignou-che-6-solved-assignment-html-p-assignment-87820

2. a) What is the principle of microscopic reversibility? How is it explained by the transition state theory of organic reactions? Explain with the help of an example.

b) Why is a substitution reaction proceeding by SN2 mechanism referred sometimes as direct displacement process? Arrange the following aliphatic bromides in the increasing order of reactivity by SN2  mechanism:

Image ignouassignments-ignouacademy-com-ignou-che-6-solved-assignment-html-p-ignou-57898

3. a) Answer the questions given for the following reaction:

Image ignouassignments-ignouacademy-com-ignou-che-6-solved-assignment-html-p-ignou-57102

i) Write the electrophile participating in this reaction.

ii) Write the reagents used for the reaction.

iii) Name the reaction.

iv) Write the complete mechanism of the reaction.

b) Which of the following pair of carbocation is more stable and why?

Image ignouassignments-ignouacademy-com-ignou-che-6-solved-assignment-html-p-solved-67948

4. a) Explain the following:

i) Electron withdrawing substituents at the carbonyl carbon increase the reactivity towards nucleophilic addition reactions.

ii) Rate of reaction of acetaldehyde with aniline increases with the increase in acidity but beyond certain limit it decreases with further increase of acidity.

b) Differentiate Saytzeff and Hofmann rules giving suitable examples.

5. a) Predict the product(s) and give the mechanism of the following reactions: 

Image ignouassignments-ignouacademy-com-ignou-che-6-solved-assignment-html-p-assignment-11094

b) Write short notes on the following giving mechanism:

i) Aldol condensation

ii) Michael addition

6. Write the chemical reaction for the following reactions along with their detail description:

a) Reimer-Tiemann reaction

b) Carbylamine reaction

c) Witting reaction

d) Wolff rearrangement

e) Hofmann rearrangement

7. a) Explain, why the reaction of m-bromoanisole with sodamide gives only one product. b) Describe the bromination reactions at allylic and benzylic positions by N-bromosuccinimide.

8. a) Write detail mechanism for the following rearrangements:

i) Wagner-Meerwein rearrangement

ii) Beckmann rearrangement

b) Explain the mechanism of [4+2] cycloaddition reaction.

9. a) Taking suitable examples, explain the role of sensitisers in photo-reactions.

b) Describe reaction types used to construct a carbon skeleton with suitable examples. 

10. Write short notes on the following:

a) Cleaning action of soaps

b) Auxochromes

c) Antibiotics

d) Condensation polymers

e) Retrosynthesis

 

 

 

 


CHE 6 2025 - Hindi

अध्यापक जांच सत्रीय कार्य

कार्बनिक अभिक्रियाओं की क्रियाविधि

रसायन विज्ञान में व्यवहारमूलक पाठ्यक्रम

पाठ्यक्रम कोड: CHE-06

सत्रीय कार्य कोड: CHE-06/TMA./2025

अधिकतम अंक : 100

नोट : निम्नलिखित सभी प्रष्नों के उत्तर लिखिए। प्रष्नों के अंक कोष्ठक में दिए गए हैं।

1.(क) उन कारकों को सूचीबद्ध कीजिए जो नाभिकस्नेहियों की आपेक्षिक प्रबलता के लिए (5) उत्तरदायी होते हैं। निम्नलिखित नाभिकस्नेहियों के संयुग्मी अम्लों को लिखिए।

equation

(ख) निम्नलिखित अभिक्रियाओं को उपचयन अथवा अपचयन अभिक्रिया के जैसे वर्गीकृत  कीजिए और सब अभिक्रियाओं के अभिकारकों तथा उत्पादों में कार्बन की उपचयन अवस्था लिखिए।

Image ignouassignments-ignouacademy-com-ignou-che-6-solved-assignment-html-p-solved-25131

2.(क) सूक्ष्मदर्शी व्युत्क्रमणीय सिद्धांत क्या होता है? कार्बनिक अभिक्रियाओं के संक्रमण अवस्था सिद्धांत द्वारा इसकी व्याख्या किस प्रकार की जाती है? एक उदाहरण द्वारा व्याख्या कीजिए।

(ख) SN2 क्रियाविधि द्वारा होने वाली समस्थापन अभिक्रिया को कभी-कभी सीधा विस्थापन प्रक्रिया क्यों कहते हैं? निम्नलिखित रैलिफैटिक ब्रोमाइडों को SN2 क्रियाविधि द्वारा होने वाली अभिक्रियाशीलता के बढ़ते हुए क्रम में लिखिए।

 

Image ignouassignments-ignouacademy-com-ignou-che-6-solved-assignment-html-p-ignou-19154

(क) निम्नलिखित अभिक्रिया के लिए दिए गए प्रश्नों के उत्तर दीजिए :

Image ignouassignments-ignouacademy-com-ignou-che-6-solved-assignment-html-p-ignou-63908

(i) इस अभिक्रिया में सम्मिलित इलेक्ट्रॉनस्नेही को लिखिए।

(ii)अभिक्रिया में प्रयुक्त अभिकर्मकों को लिखिए।

(iii) अभिक्रिया का नाम लिखिए।

(iv) अभिक्रिया की पूर्ण क्रियाविधि लिखिए।

(ख) निम्नलिखित कार्बधनायन युग्मों में से कौन सा अधिक स्थायी है तथा क्यों?

Image ignouassignments-ignouacademy-com-ignou-che-6-solved-assignment-html-p-solved-42118

(क) निम्नलिखित की व्याख्या कीजिए :

(i) कार्बोनिल कार्बन पर इलेक्ट्रॉन खींचने वाले समूहों से नाभिकस्नेही संकलन अभिक्रियाओं के प्रति अभिक्रियाशीलता बढ़ती है।

(ii) अम्लता बढ़ने पर ऐनिलीन के साथ ऐसीटल्डिहाइड की अभिक्रिया की दर बढ़ती है लेकिन एक सीमा के आगे और अधिक अम्लता के बढ़ने से दर घटती है।

(ख) उपयुक्त उदाहरण देकर सैत्जैफ तथा हॉफमान नियमों के बीच अंतर स्पष्ट कीजिए।

(क) निम्नलिखित अभिक्रियाओं के उत्पादों की प्रागुक्ति कीजिए तथा क्रियाविधि दीजिए:

i) equation

ii) equation

(ख) क्रियाविधि देते हुए निम्नलिखित पर संक्षिप्त टिप्पणी लिखिएः

(i) ऐल्डोल संघनन

(ii) माइकेल संकलन

6.निम्नलिखित अभिक्रियाओं के लिए उनकी रासायनिक अभिक्रिया सविस्तार वर्णन के साथ लिखिए

(क) राइमर-टीमन अभिक्रिया

(ख) कार्बिलऐमीन अभिक्रिया

(ग) विटिग अभिक्रिया

(घ) वाल्फ पुनर्वियास

(ङ) हॉफमन पुनर्वियास

7.(क) समझाइए क्यों -बोमोऐनिसोल की सोडामाइड से अभिक्रिया पर एक ही उत्पाद प्राप्त होता है?

(ख) N-ब्रोमोसक्सीनिमाइड द्वारा ऐलिल तथा बेज़िल स्थतियों के बोमीनीकरण की व्याख्या कीजिए।

8.(क) निम्नलिखित पुनर्वियासों के लिए विस्तार से अभिक्रिया विधि लिखिएः

i) वाग्नर-मेरवाइन पुनर्वियास

ii) बेकमान पुनर्वियास

(ख)(4+2) चक्री संकलन की क्रियाविधि लिखिए।

9. (क) उपयुक्त उदाहरणों द्वारा अभिक्रियाओं में सुग्राहीकारकों की भुमिका समझाइए।

(ख) कार्बन-ढांचा को बनाने के लिए प्रयुक्त अभिक्रियाओं के प्रकारों की व्याख्या कीजिए।

10. संक्षिप्त टिप्पणी कीजिए :

(क) साबुन की निर्मलन क्रिया

(ख) ऑक्सोक्रम

(ग) प्रतिजैविक

(घ) संघनन बहुलक

(ङ) पश्च-संश्लेषण

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