The number or sigma and pi bonds in 1-butene-3-yne are

The compound 1-butene-3-yne is  ${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{C}\equiv \mathrm{CH}$ . it involves seven sigma bonds (four are $\mathrm{C}-\mathrm{H}$ and three are $\mathrm{C}-\mathrm{C}$) and 3 pi bonds (one due to double bond and two are due to triple bond).