1. 可以無functional group都有homologous series (ie. alkane)
2. 一個compound可以有好多個functional group
但原則上只會屬於一個homologous series (雖然意義上不大)
好煩啊彈開幾尺遠2019-03-04 18:45:59
我想請問咩叫each homologous series differ from next by —CH2— group
同埋第2句唔係好明 thanks
化學艾維斯2019-03-04 18:58:43
即係以一個homologous series黎計
e.g. alkane
佢既member跟C數量小至大排序係
CH4>CH3CH3>CH3CH2CH3>CH3CH2CH2CH3...
每個member都相差一個-CH2- unit
令條carbon chain長左同molecular size大左
所以會有gradual change in physical properties
例如boiling point increase, solubility in water decrease, viscosity increase
第二句講 你係咩series 要睇返你講緊邊類compound 例如C=C就alkene COOH就 carboxylic acid
但有時一個compound可以同時有好幾個functional group 咁就要根據返佢成個compound overall去決定佢屬於咩series
但一個compound唔會同時fit into兩個homologous series