Final answer:
Cyanoacetylene possesses four pi bonds, with two coming from the triple bond between carbon atoms and two from the triple bond in the cyano group.
Step-by-step explanation:
The molecule cyanoacetylene contains multiple bonds, which include both sigma (σ) and pi (π) bonds. To determine the number of pi bonds, we need to look at the types of bonds between the atoms. A triple bond, like the one found in acetylene, consists of one sigma bond and two pi bonds. Cyanoacetylene has a triple bond between two carbon atoms, just like acetylene, hence it includes two pi bonds from this triple bond. Moreover, the cyano group (-C≡N), also possesses a triple bond, which again consists of one sigma bond and two pi bonds. Therefore, in total, cyanoacetylene contains four pi bonds.