Chemistry Exam > Chemistry Questions > Cannizzaro reaction is not given by:a)Formald...
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Cannizzaro reaction is not given by:
- a)Formaldehyde
- b)Acetaldehyde
- c)Benzaldehyde
- d)Trimethylacetaldehyde
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Cannizzaro reaction is not given by:a)Formaldehydeb)Acetaldehydec)Benz...
The Cannizzaro reaction is not given by Acetaldehyde. Aldehydes that contains alpha hydrogen atoms are not involved in Cannizzaro reaction and aldehyde like acetaldehyde contains alpha hydrogen in it. So, that's why it can't participate or involve in this reaction.
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Cannizzaro reaction is not given by:a)Formaldehydeb)Acetaldehydec)Benz...
Cannizzaro rxn is only given by compound which have no alpha hydroge. All the compound given in que. Have no alpha hydrogen except 2 acetaldehyde so it will not give cannizaro
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Cannizzaro reaction is not given by:a)Formaldehydeb)Acetaldehydec)Benz...
Cannizzaro Reaction and Acetaldehyde
Cannizzaro reaction is a redox reaction in which an aldehyde undergoes disproportionation reaction to form an alcohol and a carboxylic acid in the presence of a strong base. The reaction is named after the Italian chemist Stanislao Cannizzaro who discovered it in 1853.
The general equation for the Cannizzaro reaction is:
RCHO + OH- → RCOO- + RCH2OH
RCHO + RCHO → RCOOR + RCH2OH
Here, R represents an alkyl or aryl group.
Explanation of the answer:
Acetaldehyde is not capable of undergoing the Cannizzaro reaction because it lacks a α-hydrogen atom. The reaction needs a hydrogen atom at the α-carbon to form a carboxylic acid and an alcohol. Acetaldehyde has only one carbon atom, so it does not have an α-hydrogen atom. Hence, this reaction is not given by acetaldehyde.
Formaldehyde, benzaldehyde, and trimethylacetaldehyde all have α-hydrogen atoms and can undergo the Cannizzaro reaction.
Conclusion:
Thus, the correct answer to the given question is option 'B' which says that acetaldehyde does not undergo the Cannizzaro reaction because it lacks α-hydrogen atom.
Cannizzaro reaction is a redox reaction in which an aldehyde undergoes disproportionation reaction to form an alcohol and a carboxylic acid in the presence of a strong base. The reaction is named after the Italian chemist Stanislao Cannizzaro who discovered it in 1853.
The general equation for the Cannizzaro reaction is:
RCHO + OH- → RCOO- + RCH2OH
RCHO + RCHO → RCOOR + RCH2OH
Here, R represents an alkyl or aryl group.
Explanation of the answer:
Acetaldehyde is not capable of undergoing the Cannizzaro reaction because it lacks a α-hydrogen atom. The reaction needs a hydrogen atom at the α-carbon to form a carboxylic acid and an alcohol. Acetaldehyde has only one carbon atom, so it does not have an α-hydrogen atom. Hence, this reaction is not given by acetaldehyde.
Formaldehyde, benzaldehyde, and trimethylacetaldehyde all have α-hydrogen atoms and can undergo the Cannizzaro reaction.
Conclusion:
Thus, the correct answer to the given question is option 'B' which says that acetaldehyde does not undergo the Cannizzaro reaction because it lacks α-hydrogen atom.
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