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Câu hỏi: Cho các este sau: (1) CH2=CHCOOCH3; (2) CH3COOCH=CH2; (3) HCOOCH2-CH=CH2; (4) CH3COOCH(CH3)=CH2; (5) C6H5COOCH3; (6) HCOOC6H5; (7) HCOOCH2-C6H5; (8) HCOOCH(CH3)2. Biết rằng C6H5-: phenyl; số este khi tác dụng với dung dịch NaOH, đun nóng thu được ancol là.
A. 7
B. 5
C. 6
D. 4
A. 7
B. 5
C. 6
D. 4
(1) CH2=CHCOOCH3 + NaOH -> CH2=CHCOONa + CH3OH
(2) CH3COOCH=CH2 + NaOH -> CH3COONa + CH3CHO
(3) HCOOCH2-CH=CH2 + NaOH -> HCOONa + CH2=CH-CH2OH
(4) CH3COOCH(CH3)=CH2 + NaOH -> CH3COONa + (CH3)2CO
(5) C6H5COOCH3 + NaOH -> C6H5COONa + CH3OH
(6) HCOOC6H5 + NaOH -> HCOONa + C6H5ONa + H2O
(7) HCOOCH2-C6H5 + NaOH -> HCOONa + C6H5CH2OH
(8) HCOOCH(CH3)2 + NaOH -> HCOONa + (CH3)2CHOH
(2) CH3COOCH=CH2 + NaOH -> CH3COONa + CH3CHO
(3) HCOOCH2-CH=CH2 + NaOH -> HCOONa + CH2=CH-CH2OH
(4) CH3COOCH(CH3)=CH2 + NaOH -> CH3COONa + (CH3)2CO
(5) C6H5COOCH3 + NaOH -> C6H5COONa + CH3OH
(6) HCOOC6H5 + NaOH -> HCOONa + C6H5ONa + H2O
(7) HCOOCH2-C6H5 + NaOH -> HCOONa + C6H5CH2OH
(8) HCOOCH(CH3)2 + NaOH -> HCOONa + (CH3)2CHOH
Đáp án B.