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

Questions
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?

Organic Chemistry

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?

Organic Chemistry

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?

Organic Chemistry

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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