要求种类为羧酸
分子式中除去一个-COOH基团
剩下C5H11
即只考虑这个烃基的同分异构体种类即可.
ch3-ch2-ch2-ch2-ch2-
ch3-ch2-ch2-ch(ch3)-
ch3-ch2-ch(ch3)-ch2-
(ch3)2-ch-ch2-ch2-
ch3-ch(ch3)-ch(ch3)-
ch3-ch2-c(ch3)2-
ch3-c(ch3)2-ch2-
共7种