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Dehydration of butan-2-ol (CH₃CH(OH)CH₂CH₃) with conc. H₂SO₄ proceeds via an E₁ mechanism, forming a carbocation (CH₃CH+CH₂CH₃) as the intermediate.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Alcohols - Dehydration Oxidation Esterification
H⁺ adds to CH₃CH=CHCH₃ (but-2-ene), forming CH₃CH⁺CH₂CH₃ (secondary carbocation), stabilized by hyperconjugation.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Electronic Effects - Inductive Mesomeric Hyperconjugation and Resonance
In CH₃CH₂C(=O)CH₂CH₃, the carbon in CH₂ adjacent to C=O (second carbon) forms CH₃CH⁺CH₂C(=O)CH₃, stabilized by hyperconjugation from CH₃.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Electronic Effects - Inductive Mesomeric Hyperconjugation and Resonance
The primary carbocation CH₃CH₂CH₂CH₂⁺ can undergo a hydride shift to form CH₃CH⁺CH₂CH₃ (secondary), which is more stable due to hyperconjugation.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Electronic Effects - Inductive Mesomeric Hyperconjugation and Resonance
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