Propyne and propene can be distinguished by | Chemistry | SolveeIt

Question

Propyne and propene can be distinguished by

concentrated $H_2SO_4$

$Br_2$ in $CCl_4$

dilute $KMnO_4$

$AgNO_3$ in ammonia

Answer

$AgNO_3$ in ammonia

Explanation

Solution

Terminal alkynes forms silver salt with Tollen's reagent while alkene does not react with Tollen's reagent.
$CH_3 - C \equiv C - H+ AgNO_3 \, \, \xrightarrow{NH_3(aq)} CH_3- C \equiv C\, Ag \downarrow$
$\hspace85mm _{}^{white\, ppt}$
Therefore, Tollen's reagent can be used to distinguish a terminal alkyne like propyne from alkene as well as from internal alkynes.

Chemistry Question on Classification Of Organic Compounds

Solution