Question

Which of the following polyene is the least stable?

• A.
• B.
• C.
• D. All of them have equal stability.

Answer 1

The correct option is C

Stability of polyenes
Conjugated>Isolated>Cumulative
(a) is an example of isolated polyene
(b) is an example of conjugated polyene
(c) is an example of cumulative polyene

Isolated polyenes: Compound in which multiple bonds separated by two or more single bond.

Cumulated polyenes : Double bonds sharing a common atom.
Conjugated polyenes : Alternate single and double bonds.