which-of-the-following-alkene-is-stable-and-which-one-is-unstable-support-your-a

Question

Which of the following alkenes are stable, and which ones are unstable? Support your answer with a suitable reason.

a. trans-3,4-dibromocyclopent-1-ene
b. 1,2-dibromocyclopent-1-ene
c. trans-cyclooctene
d. trans-1,2-dibromocyclopent-1-ene

Accepted Answer

(a). Stable—A double bond can exist in a 5-membered ring
(b). Stable—A double bond can exist in a 5-membered ring
(c). Stable—A trans double bond can exist in an 8-membered ring
(d). Highly unstable—A trans double bond can not exist in a 5-membered ring.

Answer

(a). Stable—A double bond can exist in a 5-membered ring
(b). Stable—A double bond can exist in a 5-membered ring
(c). Unstable—A trans double bond can not exist in an 8-membered ring
(d). Highly unstable—A trans double bond can not exist in a 5-membered ring.

Answer

(a). Unstable—A double bond can not exist in a 5-membered ring
(b). Unstable—A double bond can not exist in a 5-membered ring
(c). Stable—A trans double bond can exist in an 8-membered ring
(d). Highly unstable—A trans double bond can not exist in a 5-membered ring.

Answer

(a). Stable—A double bond can exist in a 5-membered ring
(b). Stable—A double bond can exist in a 5-membered ring
(c). Stable—A trans double bond can exist in an 8-membered ring
(d). Stable—A trans double bond can exist in a 5-membered ring.

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Which of the following alkenes are stable, and which ones are unstable? Support your answer with a suitable reason.

a. trans-3,4-dibromocyclopent-1-ene
b. 1,2-dibromocyclopent-1-ene
c. trans-cyclooctene
d. trans-1,2-dibromocyclopent-1-ene