Question:
Propyne and propene can be distinguished by
Propyne and propene can be distinguished by
Updated On: Jun 14, 2022
- concentrated $H_2SO_4$
- $Br_2$ in $CCl_4$
- dilute $KMnO_4$
- $AgNO_3$ in ammonia
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The Correct Option is D
Solution and Explanation
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 $
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Therefore, Tollen's reagent can be used to distinguish a terminal alkyne like propyne from alkene as well as from internal alkynes.
$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.
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