JEE Main 2012 — Hydrocarbons Question with Solution
From: AIEEE 2012
Question
2–Hexyne gives trans–2–Hexene on treatment with :
Choose an option
Show full solutionCorrect option: B
Correct answer
BLi/NH3
Step-by-step explanation
Anti addition of hydrogen atoms to the the triple bond occurs when alkynes are reduced with sodium (or lithium) metal in ammonia, ethylamine, or alcohol at low temperatures. This reaction called, a dissolving metal reduction, produces an - or -alkene.
Sodium in liq. is used as a source of electrons in the reduction of an alkyne to a alkene.
Sodium in liq. is used as a source of electrons in the reduction of an alkyne to a alkene.
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This is a previous-year question from JEE Main 2012, covering the Hydrocarbons 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.