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Organic Chemistry Questions and Answers – Nucleophilic Substitution in Pyridine | Organic Chemistry Multiple Choice Questions and Answers

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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) At which position of pyridine nucleophilic substitution reaction is most preferred?
[A] First and third
[B] Second
[C] Third
[D] Second and Forth
Answer: Second and Forth
(2) Pyridine undergoes nucleophilic substitution with NaNH2 at 100℃ to give which of the following?
[A] 3-aminopyridine
[B] 2-aminopyridine
[C] 3,5-diaminopyridine
[D] 2,5-diaminopyridine
Answer: 2-aminopyridine

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(3) Pyridine undergoes nucleophilic substitution with excess of NaNH2 at 100℃ to give which of the following?
[A] 3-aminopyridine
[B] 2,6-diaminopyridine
[C] 3,5-diaminopyridine
[D] 2,5-diaminopyridine
Answer: 2,6-diaminopyridine
(4) What will be the product of the following reaction?

[A] 3-aminopyridine
[B] 2-aminopyridine
[C] 3,5-diaminopyridine
[D] 2,5-diaminopyridine
Answer: 2-aminopyridine
(5) What will be the product of the following reaction?

[A] 3-chloropyridine
[B] 2-dichloropyridine
[C] 3,5-dichloropyridine
[D] 2,5-dichloropyridine
Answer: 2-dichloropyridine
(6) Nucleophilic substitution reaction of pyridine is most effective in which of the conditions?
[A] In slightly acidic conditions
[B] In slightly basic conditions
[C] In neutral medium
[D] No specific condition requirements
Answer: No specific condition requirements
(7) What is the name of the following reaction?

[A] Chichibabin reaction
[B] Dealkylation of pyridine
[C] Hantzsch pyridine synthesis
[D] Bonnemann cyclisation
Answer: Chichibabin reaction
(8) Electron-withdrawing groups inhibit the Chichibabin reaction. Which of the following statement is not true about this fact?
[A] they increase the basicity of the ring nitrogen
[B] these electron-withdrawing groups can also form complexes with sodium amide
[C] for single electron transfer pathway, altering the distribution of spin density of the intermediate radical anion
[D] they slow down the sorption on sodium amide
Answer: they increase the basicity of the ring nitrogen

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