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JEE Main Chemistry question

ChemistryHydrocarbonsJEE Main

An unknown compound A has molecular formula C₄H₆. When A is treated with excess Br₂, a new substance B with formula C₄H₆Br₄ is formed. A also forms a white precipitate with ammoniacal silver nitrate solution. A may be

Answer: (A)

Solution

Addition of 2 equivalents of Br₂ (C₄H₆ → C₄H₆Br₄) shows A has two degrees of unsaturation, consistent with one triple bond. A positive ammoniacal AgNO₃ test

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Question ID VK-139866