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प्रश्न
Give the mechanism of the following reaction:
\[\ce{CH3CH2OH ->[H2SO4][413 K] CH3CH2-O-CH2CH3 + H2O}\]
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उत्तर
\[\ce{CH3CH2OH ->[H2SO4][413 K] \underset{Diethylether}{CH3CH2-O-CH2CH3} + H2O}\]
Mechanism: The formation of ether is a nucleophilic bimolecular reaction SN2 involving the attack of alcohol molecules on protonated alcohol as below:
(1) \[\ce{CH3CH2 - \underset{\bullet\bullet}{\overset{\bullet\bullet}{O}} - H + H+ -> CH3CH2 -^+ \underset{\bullet\bullet}{\overset{\ce{H}}{\overset{\bullet\bullet}{O}}} - H}\]
(2)
(3) \[\begin{array}{cc}
\ce{CH3CH2-\overset{+}{O}-CH2CH3 -> CH3CH2-O-CH2CH3 + H^+}\\
|\phantom{..................................}\\
\ce{H}\phantom{..................................}
\end{array}\]
\[\ce{H^+ + HSO^Θ_4 -> H2SO4}\]
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| Column I | Column II | |
| (i) |  |
(a) Nucleophilic aromatic substitution |
| (ii) | \[\begin{array}{cc} \ce{CH3 - CH = CH2 + HBr -> CH3 - CH - CH3}\\ \phantom{............................}|\phantom{}\\ \phantom{.............................}\ce{Br}\phantom{} \end{array}\] |
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| (iii) |  |
(c) Saytzeff elimination |
| (iv) |  |
(d) Electrophilic addition |
| (v) | \[\begin{array}{cc} \ce{CH3 CH2 CH CH3 ->[alc.KOH] CH3 CH = CH CH3}\\ \phantom{}|\phantom{..........................}\\ \phantom{}\ce{Br}\phantom{........................} \end{array}\] |
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