
The reaction of cyclooctyne with in the presence of aqueous gives,
A.
B.
C.
D.




Answer
499.5k+ views
1 likes
Hint: -The reaction of alkyne and in the presence of aqueous gives carbonyl compounds ,it may be aldehyde or may be ketone .This reaction is also known as Kucherov reaction.
Now. Let’s discuss the general Kucherov reaction which is shown below.
Complete step by step solution
Due to the presence of two pi-bonds, alkynes have a very low tendency for electrophilic addition than alkenes. But with the help of various promoter catalysts such as and electrophilic addition can take place.
Let us see the mechanism for the general reaction of alkyne with in the presence of aqueous ;
In the first step, protonation of alkyne will take place by the and nucleophile which will react with the pi-bond of the alkyne. After the attack both removal of hydrogen ions will take place and there will be removal of using acidic work up. Then enol will be formed. Then these enols get tautomerized to ketone which is the desired product.
Keto-enol tautomerism is a very famous and they interconverted using acid or base. Normally keto form compounds are more stable than the enol form compound. But there are few examples where keto form is also very stable.
Similarly, when cyclooctyne reacts then there will be a formation of enol which gets ketomerises to keto form as keto form is more stable.
The reaction that takes place is;
Hence, option D is correct.
Note:
With the same mechanism, when alkenes are treated with the same reagents then there will be the formation of the corresponding alcohol.
Now. Let’s discuss the general Kucherov reaction which is shown below.
Complete step by step solution
Due to the presence of two pi-bonds, alkynes have a very low tendency for electrophilic addition than alkenes. But with the help of various promoter catalysts such as
Let us see the mechanism for the general reaction of alkyne with
In the first step, protonation of alkyne will take place by the
Keto-enol tautomerism is a very famous and they interconverted using acid or base. Normally keto form compounds are more stable than the enol form compound. But there are few examples where keto form is also very stable.

Similarly, when cyclooctyne reacts then there will be a formation of enol which gets ketomerises to keto form as keto form is more stable.
The reaction that takes place is;

Hence, option D is correct.
Note:
With the same mechanism, when alkenes are treated with the same reagents then there will be the formation of the corresponding alcohol.
Latest Vedantu courses for you
Grade 10 | CBSE | SCHOOL | English
Vedantu 10 CBSE Pro Course - (2025-26)
School Full course for CBSE students
₹37,300 per year
Recently Updated Pages
Master Class 12 Business Studies: Engaging Questions & Answers for Success

Master Class 12 Economics: Engaging Questions & Answers for Success

Master Class 12 Maths: Engaging Questions & Answers for Success

Master Class 12 Biology: Engaging Questions & Answers for Success

Master Class 12 Physics: Engaging Questions & Answers for Success

Master Class 12 English: Engaging Questions & Answers for Success

Trending doubts
A deep narrow valley with steep sides formed as a result class 12 biology CBSE

a Tabulate the differences in the characteristics of class 12 chemistry CBSE

Why is the cell called the structural and functional class 12 biology CBSE

Which are the Top 10 Largest Countries of the World?

Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE

Derive an expression for electric potential at point class 12 physics CBSE
