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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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संबंधित प्रश्न
Give reasons for the following:
(CH3)3C–O–CH3 on reaction with HI gives (CH3)3C–I and CH3–OH as the main products and not (CH3)3C–OH and CH3–I.
Arrange the compounds of the following set in order of reactivity towards SN2 displacement:
1-Bromobutane, 1-Bromo-2, 2-dimethylpropane, 1-Bromo-2-methylbutane, 1-Bromo-3-methylbutane
Which would undergo SN2 reaction faster in the following pair and why ?
CH3 – CH2 – Br and CH3 – CH2 – I
Which of the following is optically inactive?
Which of the following pairs is/are correctly matched?
| Reaction | Product | |
| I | RX + AgCN | RNC |
| II | RX + KCN | RCN |
| III | RX + KNO2 | \[\begin{array}{cc} \phantom{.......}\ce{O}\\ \phantom{.....}/\\ \ce{R - N}\phantom{....}\\ \phantom{.....}\backslash\backslash\\ \phantom{.......}\ce{O} \end{array}\] |
| IV | RX + AgNO2 | \[\ce{R-O-N=O}\] |
In the SN1 reaction, racemization takes place. It is due to:
Identify the end product (C) in the following sequence:
\[\ce{C2H5OH ->[SOCl2][Pyridine] A ->[KCN {(alc.)}] B ->[2H2O/H^+] C}\]
Aryl halides are extremely less reactive towards nucleophilic substitution. Predict and explain the order of reactivity of the following compounds towards nucleophilic substitution:
| (I) |  |
| (II) |  |
| (III) |  |
Give reason for the following:
The product formed during SN1 reaction is a racemic mixture.
The decreasing order of reactivity of the following compounds towards nucleophilic substitution (SN2) is ______.
