PYQs with Answers | Organic Reaction Mechanisms (Organic Chemistry) | CSIR (Council of Scientific & Industrial Research) Chemical Sciences

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Question 14 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

The following carboxylic acids undergo decarboxylation upon heating. The ease of decarboxylation is in the order

Carboxylic acids undergo decarboxylation upon heating

History

B $>$ A $>$ C

$C > A > B$

$A > C > B$

C $>$ B $>$ A

Organic ChemistryOrganic Reaction MechanismsInvolving Addition Reactions with Electrophilic Species

Question 15 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

The synthetic equivalent of the given synthon is

Synthetic equivalent of the given synthon

History

t-butyl isocyanide

t-butyl cyanate

t-butyl cyanide

t-butyl isocyanate

Organic ChemistryOrganic Reaction MechanismsInvolving Addition Reactions with Nucleophilic Species

Question 16 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

The major product formed in the following reaction is

Product formed in the following reaction

History

Sodium ethylate, is the ionic, organic compound

It dissolves in polar solvents such as ethanol

Sodium ethoxide, also referred to as sodium

White solid, although impure samples

Organic ChemistryOrganic Reaction MechanismsInvolving Addition Reactions with Electrophilic Species

Question 17 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

The major product formed in the following transformation is

Product formed in the following transformation

History

The Nazarov cyclization reaction is a chemical

The synthesis of cyclopentenones

The reaction is typically divided into classical

Chemical reaction used in organic chemistry

Organic ChemistryOrganic Reaction MechanismsInvolving Addition Reactions with Electrophilic Species

Question 18 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

The major product formed in the following reaction is

Structure of CSA = Camphor sulfonic Acid

History

Latin form Acidum camphoricum, is a white

It exists in three optically different forms

Crystallizable substance obtained from the oxidation

Strong acid called camphor-sulfonic acid

Organic ChemistryOrganic Reaction MechanismsInvolving Addition Reactions with Radical Species

Question 19 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

The major product formed in the following reaction sequence is

Product formed in the following reaction sequence

History

Tert-Butyllithium is a chemical compound

The methoxy group of the nitro methoxy aromatic

A typical nucleophilic substitution reaction occurs

Organolithium compound, it has applications in organic

Organic ChemistryOrganic Reaction MechanismsInvolving Addition Reactions with Electrophilic Species

Solved PYQs 14-19 of 42: Organic Reaction Mechanisms (Organic Chemistry) | CSIR (Council of Scientific & Industrial Research) Chemical Sciences | PYQ 2020

Video Course 2026 (354 Lectures- 324.5 hrs): Offline Support

Online Tests (3 tests- 100 questions each): Analytics & Explanations

Study Material (471 Notes): 2026-2027 Syllabus

963 PYQs with Explanations (2026-2027 Exam)

Question 14 | PYQ 2020MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

History

Question 15 | PYQ 2020MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

History

Question 16 | PYQ 2020MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

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Question 17 | PYQ 2020MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

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Question 18 | PYQ 2020MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

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Question 19 | PYQ 2020MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

History

Question 14 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

Question 15 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

Question 16 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

Question 17 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

Question 18 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]

Question 19 | PYQ 2020
MCQ: Read the question, then carefully choose the correct answer(s). [Select all that apply.]