(12分)请写出下列有机物的官能团。
CH₃CH₂CH₂COOH                  ，   HCOOC₂H₅                    ，
CH₃CH₂CH₂CH₂－Cl                  ，  CH₃CHO                     ，
                    ，                   ，
                  ，   CH₃CH₂CH＝CHCH₃               ，