Question

Question: Classify each diene as isolated or conjugated.

a.

b.

c.

d.

Short answer

Answer

a. The given diene is a conjugated diene.

b. The given diene is an isolated diene.

c. The given diene is a conjugated diene.

d. The given diene is an isolated diene.

Step-by-step solution

Dienes

Compounds comprising two carbon-carbon $\left(\mathrm{C}=\mathrm{C}\right)$double bonds set apart by single bonds are referred to as dienes. An example of a diene is 1,2-propadiene.

Isolated and conjugated dienes

• Isolated dienes are compounds comprising two double bonds set apart by two or more sigma bonds.
• Compounds in which the double bonds are set apart by one sigma bond are called conjugated dienes.

Identification of the Isolated and Conjugated diene

a. In the given diene, two double bonds are separated by a single bond. Hence, it is a conjugated diene.

b. In the given diene, two double bonds are separated by two sigma bonds. Hence, it is an isolated diene.

c. In the given diene, two double bonds are separated by a single bond. Hence, it is a conjugated diene.

d. In the given diene, two double bonds are separated by more than a single bond. Hence, it is an isolated diene.