Question

Propyne and propene can be distinguished by:

• A. conc. $H_{2}S{O}_4$
• B. $B{r}_2$ in $CC{l}_4$
• C. dil. $KMn{O}_4$
• D. $AgN{O}_3$ in ammonia

Answer 1

Answer: (D)

$AgN{O}_3$ in ammonia

Terminal alkynes (alkynes in which triple bond is at the end of the compound) react with silver nitrate in ammonia and gives yellow to brown colored precipitate due to formation of silver acetylides.

Alkenes do not react with silver nitrate in ammonia.