JEE Main 2026 — Aldehydes and Ketones Question with Solution
JEE Main 2026 (05 April Shift 2)
Question
Given below are two statements :
Statement I: The condensation reaction between and under optimum pH will produce .
Statement II: The molecule, will generate in the presence of dilute acid.
In the light of the above statements, choose the correct answer from the options given below :
Statement I: The condensation reaction between and under optimum pH will produce .
Statement II: The molecule, will generate in the presence of dilute acid.
In the light of the above statements, choose the correct answer from the options given below :
Choose an option
Show full solutionCorrect option: A
Correct answer
ABoth Statement I and Statement II are true
Step-by-step explanation
Statement I: Semicarbazide is . The lone pair on the group attached to the carbonyl carbon is involved in resonance with the group, making it less nucleophilic. Therefore, the group attached to the group acts as the nucleophile. The condensation of acetaldehyde () with semicarbazide under optimum pH (around 3.5) yields acetaldehyde semicarbazone, . Thus, Statement I is true.
Statement II: The molecule is a hemiacetal. Hemiacetals are unstable and readily undergo hydrolysis in the presence of dilute acid to yield the corresponding aldehyde and alcohol. Hydrolysis of gives benzaldehyde () and methanol (). Thus, Statement II is also true.
Both Statement I and Statement II are true.
Answer: Both Statement I and Statement II are true
Statement II: The molecule is a hemiacetal. Hemiacetals are unstable and readily undergo hydrolysis in the presence of dilute acid to yield the corresponding aldehyde and alcohol. Hydrolysis of gives benzaldehyde () and methanol (). Thus, Statement II is also true.
Both Statement I and Statement II are true.
Answer: Both Statement I and Statement II are true
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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.