When $1 -$ pentene is treated with an acid, $t r a n s - 2 -$ pentene is produced. Propose mechanism of this isomerization reaction and justify.

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Solution

In the first step, the electrons of pi bond are donated to the hydrogen ion to form more stable secondary carbocation. This is followed by the loss of a proton to form trans-2-pentene. thus it is a rearrangement reaction and involves migration of double bond.

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When 1−pentene is treated with an acid, trans−2−pentene is produced. Propose mechanism of this isomerization reaction and justify.

In the first step, the electrons of pi bond are donated to the hydrogen ion to form more stable secondary carbocation. This is followed by the loss of a proton to form trans-2-pentene. thus it is a rearrangement reaction and involves migration of double bond.

When $1 -$ pentene is treated with an acid, $t r a n s - 2 -$ pentene is produced. Propose mechanism of this isomerization reaction and justify.