Propose a Structure: for CsHs First calculate the number of elements of unsaturation. 。Remember: >A double bond is one element of unsaturation. >A ring is one element of unsaturation. >A triple bond is two elements of unsaturation.= Chapter 7 8Chapter 7 8 Propose a Structure: • First calculate the number of elements of unsaturation. • Remember: ➢A double bond is one element of unsaturation. ➢A ring is one element of unsaturation. ➢A triple bond is two elements of unsaturation. => for C5H8