The major product formed in the dehydration of 1butanol by heating with concentrated $H_{2} S O_{4}$ is _______.
1, 3 butadiene
trans- 2 - butene
cis- 2- butene
1-butene

Question

The major product formed in the dehydration of 1butanol by heating with concentrated H-2SO-4 is -1- 3 butadienetrans- 2 - butenecis- 2- butene1-butene

Toppr Admin · Accepted Answer

Primary alcohols undergo bimolecular elimination ( $E 2$ mechanism).

Oxygen donates two electrons to a proton from sulfuric acid $H_{2} S O_{4}$ , forming an alkyloxonium ion. Then the nucleophile $H S O_{4}^{-}$ back-side attacks one adjacent hydrogen and the alkyloxonium ion leaves in a concerted process, making a double bond. There is no rearrangement in bimolecular reactions.

The product is $1 - B u t e n e$

The major product formed in the dehydration of 1butanol by heating with concentrated H2SO4 is _______.1, 3 butadienetrans- 2 - butenecis- 2- butene1-butene

The major product formed in the dehydration of 1butanol by heating with concentrated $H_{2} S O_{4}$ is _______.
1, 3 butadiene
trans- 2 - butene
cis- 2- butene
1-butene