Question

Which of the following gives propyne on hydrolysis?

• A. $Al_4C_3$
• B. $Mg_2C_3$
• C. $B_4C$
• D. $La_4C_3$

Answer 1

Answer: (B)

$Mg_2C_3$

Answer 2

Magnesium carbide on hydrolysis gives propyne. $Mg _{2} C _{3}+4 H _{2} O \longrightarrow \underset{\text{propyne}}{CH _{3} C \equiv CH} +2 Mg ( OH )_{2}$ $Al _{4} C _{3}+12 H _{2} O \longrightarrow \underset{\text{Methane}}{3 CH _{4}} \uparrow+4 Al ( OH )_{3}$