1. Tardigrade
  2. Question
  3. Chemistry
  4. The carbide of which of the following metals on hydrolysis gives allylene or propyne?

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. The carbide of which of the following metals on hydrolysis gives allylene or propyne?

The s-Block Elements

Solution:

$Be_2C$ and $Al_4C_3$ on reaction with water liberate methane gas while $CaC_2$ gives acetylene gas. $Mg$ forms $MgC_2$ either when heated directly with carbon in an electric furnace or when $MgO$ is heated with carbon. When $MgC_2$ is heated, it changes into $Mg_2C_3$. The carbide, $Mg_2C_3$ reacts with $H_2O$ to form propyne.
$Mg_2C_3 +4H_3O \rightarrow 2Mg(OH)_2 + CH_3C \underset{\text{Propyne}}{\equiv CH}$