how many (sigma) and (pi) bonds are present in buta-1,3-diyne?

1.	how many (sigma) and (pi) bonds are present in buta-1,3-diyne?
Answer» SOLUTION :`UNDERSET("Buta-1,3-diyne")(H-C-=C-C-=C-H)" "SIGMA`-BONDS: 5, `PI`-bonds:4

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