KVPY 2020-21 SA Exam Previous Papers

A hydrocarbon X with molecular formula ${\mathit{C}}_4{\mathit{H}}_6$ decolorizes bromine water and forms a white precipitate in ethanolic $\mathit{A}\mathit{g}\mathit{N}{\mathit{O}}_3$ solution. Treatment of X with $\mathit{H}\mathit{g}\mathit{C}{\mathit{l}}_2$ in aqueous ${\mathit{H}}_2\mathit{S}{\mathit{O}}_4$ produces a compound, which gives a yellow precipitate when treated with ${\mathit{I}}_2$ and NaOH. The structure of X is: