Question

A hydrocarbon which decolorises $KMn{O}_4$ solution & gives precipitate with ammonical $AgN{O}_3$ is:

• A. 2-butene
• B. n-pentane
• C. 2-butyne
• D. 1-butyne

Answer 1

The correct option is D 1-butyne

$KMn{O}_4$ oxidizes $Alkenes$ and $Alkynes$ into dicarboxylic acids. Terminal $alkyne$ like $1-Butyne$ converts into $Propionicacid$ and $C{O}_2$ .

and $1-Butyne$ gives a white precipitate of silver butynide with ammonical $AgN{O}_3$. This reaction is also particularly for terminal alkynes only.