The major product formed in the dehydration of 1butanol by heating with concentrated $H_{2} S O_{4}$ is _______.

trans- 2 - butene

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cis- 2- butene

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1-butene

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1, 3 butadiene

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Solution

The correct option is D 1-butene

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 $1 - B u t e n e$

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H_{2} S O_{4}

When 3, 3-dimethyl-2-butanol is heated with $H_{2} S O_{4}$ the major product obtained is

2 - b u t e n e

O_{3}

Z n / H_{2} O

O_{3}

Z n / H_{2} O

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