Which organic compound is formed by the controlled catalytic hydration of ethyne (acetylene) in the presence of and at ?
Answer and explanation
Correct answer: D. Acetaldehyde (ethanal)
- Step 1: Ethyne () adds water across the triple bond to form vinyl alcohol ().
- Step 2: Vinyl alcohol is an unstable enol that rapidly tautomerizes into the stable keto form, acetaldehyde ().
Answer
Acetaldehyde (ethanal).
Why not the others: 'Ethanol' requires reduction or hydration of ethene (); 'Acetic acid' is produced by subsequent oxidation of ethanal; 'Diethyl ether' is formed by condensation of ethanol with sulfuric acid.
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