2、通式与不饱和度(环的数目) 不饱和度一分子组成的氢原子数目与理论上最 大可能数目之差的情况 a Saturated Hydrocarbons: C,H2n+2 For a formula:CH a Degree of unsaturated 22=(2n+2-m)/2 a If it is a cycloalkane, the degree of unsaturated equals to the number of ring2、通式与不饱和度（环的数目） „ 不饱和度 — 分子组成的氢原子数目与理论上最 大可能数目之差的情况 „ Saturated Hydrocarbons: CnH2n+2 „ For a formula: CnHm „ Degree of unsaturated Ω = (2n+2-m)/2 „ If it is a cycloalkane, the degree of unsaturated equals to the number of ring