CICHCOOH CI3CCOOH CH3 (CH2)3CO2H Chloroethanoic acid Trichloroethanoic acid Pentanoic acid (氯代乙酸) (三氯代乙酸) (戊酸) COOH COOH COOH Benzoic acid 1-Naphthoic acid 2-Naphthoic acid (1-萘酸) (2-萘酸)ClCH2 COOH Chloroethanoic acid ( 氯 代 乙 酸 ) Cl 3 CCOOH Trichloroethanoic acid ( 三 氯 代 乙 酸 ) CH3 (CH2 ) 3 CO2 H Pentanoic acid ( 戊 酸 ) ( 1-萘 酸 ) COOH COOH COOH Benzoic acid 1-Naphthoic acid 2-Naphthoic acid ( 2-萘 酸 )