At higher temperature, Ethyne on reaction with water in the presence of HgSO4 and H2SO4 gives:
Correct answer: B. Acetaldehyde
- A. Acetone
- B. Acetaldehyde
- C. Acetic acid
- D. Ethyl alcohol
Explanation
Water adds across ethyne in the presence of HgSO4 and H2SO4 to form an unstable enol, CH2=CHOH. This enol undergoes keto-enol tautomerism to give the more stable aldehyde ethanal, CH3CHO, also called acetaldehyde. The likely mistake is choosing ethyl alcohol because water adds to the triple bond, but the mercury-catalysed hydration ultimately produces a carbonyl compound, not an alcohol.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Alkynes
Alkynes are unsaturated hydrocarbons containing a carbon-carbon triple bond, with sp-hybridised carbon atoms and a linear arrangement around the bond. The content includes nomenclature, preparation, acidity of terminal alkynes, and addition reactions with hydrogen, halogens, hydrogen halides and water, as well as oxidation.
Practise Chemistry of Hydrocarbons
1,091 free Chemistry of Hydrocarbons MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Alkynes questions
Product formed when 2-pentyne reacts with ozone in the absence of Zinc is __________?
Ozonolysis of acetylene gives:
Which of the following has acidic hydrogen?
Which of the following gases is used for welding?
The compound C3H4 has a triple bond, which is indicated by its reaction with____________?
Acetylene gives: