... cụng thc ln lt l: A C2H5COOH v CH3COOCH3 C.CH2= CHCOOH v HCOOCH=CH2 B CH2=CHCOOCH3v C2H3COOH D.CH2=CHCOOH v CH3COOCH=CH2 Cõu 28 Phn ng quan trng nht ca este l A phn ng este hoỏ B phn ng nitro ... thu c cỏc este A CH3COO-CH2-CH2-OOCCH3 v CH3COO-CH2-CH2OH B CH3COO-CH2-CH2-OH v CH3COO-CH2-CH2-COO-CH3 C CH3-OOC-CH2-CH2-OH v CH3COO-CH2-CH2-OOC-CH3 D CH3COO-CH2-CH2-OH v CH3-OOC-CH2-CH2-COO-CH3 ... sau cú phn ng este hoỏ vi HO-CH 2-COOH: A CH3COOH, C2H5OH, CH3OH,CH2=CH-COOH B HCOOH, CH3OH, CH3CHO, C2H5OH C CH2=CH-COOH, CH3OH, HCHO, HCOOH D CH3OH, C2H5OH, HCOOH, HCHO Cõu 31 Este l cht hu...