Answer
Verified
385.7k+ views
Hint: To distinguish one from another use reactions where a change of physical characteristics happens. For example, change of color of the solution, precipitation takes place, generation of effervescence, etc.
Complete step by step answer:
Structures of formaldehyde and acetaldehyde are
When formaldehyde and acetaldehyde are treated with iodine in NaOH. Acetaldehyde gives yellow color precipitation. But on the other hand, formaldehyde does not react with it.
From this reaction, a change of physical characteristic happens which can be visualized to understand the difference between formaldehyde and acetaldehyde.
The overall reaction is shown below.
The mechanism is shown below,
This reaction is commonly known as the iodoform reaction.
Iodoform reaction is used to prove the presence of \[R - CO - C{H_3}\] a group of carbonyl and \[R - CH\left( {OH} \right) - C{H_3}\] alcohol. In this reaction oxidation of the carbonyl group and alcohol group takes place. By oxidation, they form a carboxylic acid. And besides this, yellow precipitation of iodoform takes place in this reaction. This yellow precipitation is the indication that the reaction occurred.
Note:
When chlorine is used instead of iodine then it is called a chloroform reaction. In this reaction precipitation of white chloroform is formed. And when bromine is used instead of iodine or chlorine then it is called a bromoform reaction. In this reaction precipitation of pale yellow bromoform is formed. These types of reactions are collectively known as haloform reactions.
Complete step by step answer:
Structures of formaldehyde and acetaldehyde are
When formaldehyde and acetaldehyde are treated with iodine in NaOH. Acetaldehyde gives yellow color precipitation. But on the other hand, formaldehyde does not react with it.
From this reaction, a change of physical characteristic happens which can be visualized to understand the difference between formaldehyde and acetaldehyde.
The overall reaction is shown below.
The mechanism is shown below,
This reaction is commonly known as the iodoform reaction.
Iodoform reaction is used to prove the presence of \[R - CO - C{H_3}\] a group of carbonyl and \[R - CH\left( {OH} \right) - C{H_3}\] alcohol. In this reaction oxidation of the carbonyl group and alcohol group takes place. By oxidation, they form a carboxylic acid. And besides this, yellow precipitation of iodoform takes place in this reaction. This yellow precipitation is the indication that the reaction occurred.
Note:
When chlorine is used instead of iodine then it is called a chloroform reaction. In this reaction precipitation of white chloroform is formed. And when bromine is used instead of iodine or chlorine then it is called a bromoform reaction. In this reaction precipitation of pale yellow bromoform is formed. These types of reactions are collectively known as haloform reactions.
Recently Updated Pages
what is the correct chronological order of the following class 10 social science CBSE
Which of the following was not the actual cause for class 10 social science CBSE
Which of the following statements is not correct A class 10 social science CBSE
Which of the following leaders was not present in the class 10 social science CBSE
Garampani Sanctuary is located at A Diphu Assam B Gangtok class 10 social science CBSE
Which one of the following places is not covered by class 10 social science CBSE
Trending doubts
Which are the Top 10 Largest Countries of the World?
The states of India which do not have an International class 10 social science CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
How do you graph the function fx 4x class 9 maths CBSE
One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE
Difference Between Plant Cell and Animal Cell
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Why is there a time difference of about 5 hours between class 10 social science CBSE
Name the three parallel ranges of the Himalayas Describe class 9 social science CBSE