Classify each of the four compounds below as a conjugated, isolated, or cumulated diene.
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Question “Classify each of the four compounds below as a conjugated, isolated, or cumulated diene.”
Answer
The hydrocarbon that has two carbon-carbon double bonds in a compound in organic chemistry is called diene. The location of double bonds determines which type of diene you will find.
Cumulated diene contains adjacent double bonds. A single carbon (common atom) shares the double bonds.
Example:
Conjugated dene is a compound that has two double bonds, which are separated by one bond.
Example:
Isolated dene refers to a compound where two double bonds are separated with two or more carbonatoms.
Example:
(a)
The following is the compound:
One bond separates the two double bonds. It is therefore a conjugated dene.
Double bonds cannot be separated by single bonds. It is therefore not an isolated diene.
A common atom does not share the double bonds. It is therefore not a cumulated dene.
(b)
The following is the compound:
Double bonds cannot be separated by one bond. It is therefore not a conjugated dene.
Double bonds can be separated by more than one bond. It is therefore an isolated diene.
Double bonds cannot be shared by one carbon atom. It is therefore not a cumulated dene.
(c)
The following is the compound:
Double bonds cannot be separated by one bond. It is therefore not a conjugated dene.
Double bonds can be separated by more than one bond. It is therefore an isolated diene.
Double bonds cannot be shared by one carbon atom. It is therefore not a cumulated dene.
(d)
The following is the compound:
One bond separates the two double bonds. It is therefore conjugated diene.
Double bonds cannot be separated by single bonds. It is therefore not an isolated diene.
Double bonds cannot be shared by a common atom. It is therefore not a cumulated dene.
Ans: Part A
This compound is the following type alkene:
Part b
This compound is the following type alkene:
Part c
This compound is the following type alkene:
Part d
This compound is the following type alkene:
Conclusion
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