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# $Mg_2C_3$ reacts with water forming propyne.$C_3^{4-}$ has how many sigma and pi bonds respectively

$\begin{array}{1 1}(a)\;\text{2 sigma and 2 pi bonds}\\(b)\;\text{2 sigma and 1 pi bonds}\\(c)\;\text{2 sigma and 3 pi bonds}\\(d)\;\text{3 sigma and 1 pi bond}\end{array}$

$Mg_2C_3+2H_2O\rightarrow C_3H_4+2MgO$
$C_3H_4(C_3^{4-}+4H^+)$
Two sigma bonds
Two pi bonds are there in $C_3^{4-}$
Hence (a) is the correct answer.