JEE Main 2026 — Aldehydes and Ketones Question with Solution
JEE Main 2026 (06 April Shift 2)
Question
'' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at K. '' is the product which is obtained by the reaction of ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. IUPAC name of product obtained from '' and '' in the presence of barium hydroxide followed by heating is :
Choose an option
Show full solutionCorrect option: B
Correct answer
B4-Methylpent-3-en-2-one
Step-by-step explanation
Hydrolysis of prop-1-yne in the presence of and dilute yields acetone.
Thus, is acetone.
Reaction of ethane nitrile () with methyl magnesium bromide () followed by hydrolysis also yields acetone.
Thus, is acetone.
Reaction of and (both acetone) in the presence of followed by heating results in an aldol condensation.
Heating causes dehydration to form an unsaturated ketone.
Numbering the principal carbon chain to give the lowest locant to the ketone group, the IUPAC name of the product is 4-methylpent-3-en-2-one.
Answer: 4-Methylpent-3-en-2-one
Thus, is acetone.
Reaction of ethane nitrile () with methyl magnesium bromide () followed by hydrolysis also yields acetone.
Thus, is acetone.
Reaction of and (both acetone) in the presence of followed by heating results in an aldol condensation.
Heating causes dehydration to form an unsaturated ketone.
Numbering the principal carbon chain to give the lowest locant to the ketone group, the IUPAC name of the product is 4-methylpent-3-en-2-one.
Answer: 4-Methylpent-3-en-2-one
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This is a previous-year question from JEE Main 2026, covering the Aldehydes and Ketones chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.