Help ? ?? **5.** The structure of acetylsalicylic acid (aspirin) is shown below. How many pi bonds are present in this compound? How many sigma bonds? What parts of the molecule are free to rotate, and what parts are rigid?[Diagram of acetylsalicylic acid: Includes a benzene ring with alternating single and double bonds. The structure features a carboxyl group (COOH) and an ester linkage (OCOCH₃) attached to the benzene ring.]**6.** Shown below are cytosine and adenine, two bases that are important in genetic coding. Assign a molecular geometry and hybridization to each interior atom numbered in these two bases.(a) Cytosine structure diagram:- Numbered atoms with chemical groups: C=O, NH₂, N in the ring.(b) Adenine structure diagram:- Numbered atoms with chemical groups: NH₂, multiple N atoms in the ring.**7.** Which hybridization schemes allow the formation of at least one pi bond? Briefly explain why.

pi bond between two atoms are formed when two orbitals of two atoms are parallely overlapped. The pi bond is assigned by double bond between two atoms. NOTE - When two atoms are connected by double bond then one bond is sigma bond and another is pi bond, like follows: Where single bond is formed by head - on overlap. This bond is donated by single bond.the parts of the molecule that is connected by single bond , then that part is free to rotate where if the atoms are connected by double bond, then it is rigid, cannot rotate easily.