JEE Exam > JEE Questions > Aromatic aldehydes undergo disproportionation...
Start Learning for Free
Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known as
- a)Wurtz reaction
- b)Cannizzaro reaction
- c)Friedel-Craft reaction
- d)Claisen-reaction.
Correct answer is option 'B'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Most Upvoted Answer
Aromatic aldehydes undergo disproportionation in presence of sodium or...
Explanation:
Cannizzaro Reaction:
- The Cannizzaro reaction is a redox reaction in which an aldehyde undergoes disproportionation in the presence of a strong base like sodium or potassium hydroxide.
- In this reaction, one molecule of aldehyde is oxidized to the corresponding carboxylic acid, while another molecule of the same aldehyde is reduced to the corresponding alcohol.
- The general equation for the Cannizzaro reaction is:
2RCHO + 2OH- → RCOOH + RCH2OH
Mechanism:
- The reaction proceeds through a nucleophilic addition-elimination mechanism.
- The hydroxide ion attacks the carbonyl carbon of the aldehyde, forming a tetrahedral intermediate.
- The intermediate then collapses to form the carboxylic acid and alcohol products.
- The carboxylic acid and alcohol are formed in a 1:1 ratio.
Example:
- Benzaldehyde undergoes Cannizzaro reaction in the presence of sodium hydroxide to give benzoic acid and benzyl alcohol.
- The reaction can be represented as:
2C6H5CHO + 2NaOH → C6H5COONa + C6H5CH2OH
Significance:
- The Cannizzaro reaction is an important synthetic tool for the preparation of carboxylic acids and alcohols from aldehydes.
- It is particularly useful for aldehydes that do not undergo direct oxidation to carboxylic acids.
By understanding the Cannizzaro reaction and its mechanism, one can predict the products formed when aromatic aldehydes are treated with sodium or potassium hydroxide.
Cannizzaro Reaction:
- The Cannizzaro reaction is a redox reaction in which an aldehyde undergoes disproportionation in the presence of a strong base like sodium or potassium hydroxide.
- In this reaction, one molecule of aldehyde is oxidized to the corresponding carboxylic acid, while another molecule of the same aldehyde is reduced to the corresponding alcohol.
- The general equation for the Cannizzaro reaction is:
2RCHO + 2OH- → RCOOH + RCH2OH
Mechanism:
- The reaction proceeds through a nucleophilic addition-elimination mechanism.
- The hydroxide ion attacks the carbonyl carbon of the aldehyde, forming a tetrahedral intermediate.
- The intermediate then collapses to form the carboxylic acid and alcohol products.
- The carboxylic acid and alcohol are formed in a 1:1 ratio.
Example:
- Benzaldehyde undergoes Cannizzaro reaction in the presence of sodium hydroxide to give benzoic acid and benzyl alcohol.
- The reaction can be represented as:
2C6H5CHO + 2NaOH → C6H5COONa + C6H5CH2OH
Significance:
- The Cannizzaro reaction is an important synthetic tool for the preparation of carboxylic acids and alcohols from aldehydes.
- It is particularly useful for aldehydes that do not undergo direct oxidation to carboxylic acids.
By understanding the Cannizzaro reaction and its mechanism, one can predict the products formed when aromatic aldehydes are treated with sodium or potassium hydroxide.
Attention JEE Students!
To make sure you are not studying endlessly, EduRev has designed JEE study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in JEE.
|
Explore Courses for JEE exam
|
|
Similar JEE Doubts
Top Courses for JEEView all
Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer?
Question Description
Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer?.
Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer?.
Solutions for Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE.
Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
Here you can find the meaning of Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer?, a detailed solution for Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known asa)Wurtz reactionb)Cannizzaro reactionc)Friedel-Craft reactiond)Claisen-reaction.Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice JEE tests.
|
|
Explore Courses for JEE exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup