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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?
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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.
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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?.
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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
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