The total number of 'Sigma' and Pi bonds in 2-formylhex-4-enoic acid is

A single bond is a result of the axial overlap of bonding orbitals. Hence, it contributes a sigma bond. A multiple bond (double or triple bond) contain one sigma bond and the remaining are pi bonds. 

The total number of sigma and pi bond in 

 $2$-Formyl hex-$4$-enoic acid is $22$.

The compound can be represented as,