CH ≡CH+C2 H3 OH HgSO4-Y H2 O⟶X X is (a) CH3 OH (b) C2 H5 OH (c) CH3 CHO+C2 H5 OH (d) CH2=CHOH^2

Name: Problem 166, Chapter 25: A Complete Resource Book in Chemistry for JEE Main
Uploaded: 2021-09-18T04:49:52-08:00
Duration: 1 min 3 s
Channel: Narayan Hari
Description: CH ≡CH+C2 H3 OH HgSO4-Y H2 O⟶X X is (a) CH3 OH (b) C2 H5 OH (c) CH3 CHO+C2 H5 OH (d) CH2=CHOH^2

step 1 In this problem the reaction will happen something like this. CH triple bone CH plus C2H5 OH wil

CH ≡CH+C2 H3 OH HgSO4-Y H2 O⟶X X is (a) CH3 OH (b) C2 H5 OH...

$\mathrm{CH} \equiv \mathrm{CH}+\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{OH} \stackrel{\mathrm{HgSO}_{4}}{-\mathrm{Y}} \stackrel{\mathrm{H}_{2} \mathrm{O}}{\longrightarrow \mathrm{X}}$ $\mathrm{X}$ is (a) $\mathrm{CH}_{3} \mathrm{OH}$ (b) $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$ (c) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$ (d) $\mathrm{CH}_{2}=\mathrm{CHOH}^{2}$

$\mathrm{CH} \equiv \mathrm{CH}+\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{OH} \stackrel{\mathrm{HgSO}_{4}}{-\mathrm{Y}} \stackrel{\mathrm{H}_{2} \mathrm{O}}{\longrightarrow \mathrm{X}}$
$\mathrm{X}$ is
(a) $\mathrm{CH}_{3} \mathrm{OH}$
(b) $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$
(c) $\mathrm{CH}_{3} \mathrm{CHO}+\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$
(d) $\mathrm{CH}_{2}=\mathrm{CHOH}^{2}$

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Key Concepts

Mercury(II)-Catalyzed Hydration of Alkynes

This concept involves the use of mercury(II) salts (such as HgSO4) as catalysts to add water across a carbon–carbon triple bond. The reaction initially forms an enol intermediate via electrophilic activation of the alkyne, which then tautomerizes to the corresponding carbonyl compound. This mechanism avoids problems like carbocation rearrangements that can occur in acid-catalyzed hydration reactions.

Enol-Keto Tautomerism

Enol-keto tautomerism refers to the rapid equilibrium between enol forms (vinyl alcohols) and their more stable keto forms (aldehydes or ketones). In hydration reactions, the initially formed enol is generally unstable and quickly rearranges to produce the corresponding carbonyl compound, which is often observed as the final product.

Electrophilic Addition Mechanism

This mechanism describes how electrophiles add to electron-rich carbon–carbon multiple bonds. In such reactions, an electrophile (often generated by a catalyst such as HgSO4) attacks the ? electrons of a multiple bond, forming a reactive intermediate that is subsequently attacked by a nucleophile (like water). This process is fundamental in many addition reactions including those involving alkynes and alkenes.

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