90. What monomer(s) is/are needed to synthesize the polymer shown below? I. HOCH2CH2OH II. HOOCCH2CH2COOH III. HOCH2CH2COOH IV. HOCH=CHOH V. HOOCCH=CHCOOH (A) II (B) III (C) I and II (D) IV and V (E) II and III

90. What monomer(s) is/are needed to synthesize the polymer shown below?
I. HOCH₂CH₂OH II. HOOCCH₂CH₂COOH III. HOCH₂CH₂COOH IV. HOCH=CHOH V. HOOCCH=CHCOOH
(A) II
(B) III
(C) I and II
(D) IV and V
(E) II and III

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統計： A(1), B(5), C(13), D(0), E(0) #3233356

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86. Carminic acid, a naturally occurring red pigment extracted from the cochineal insect, contains 53.66% C, 4.09% H and 42.25% O by mass. A titration required 10.00 mL of 0.5 M NaOH to neutralize 2.46 g carminic acid. Assuming there is only one acidic hydrogen per molecule, what is the empirical formula and molecular formula of carminic acid? (Na = 23.0 g/mole) (A) empirical formula: C22H20O13； molecular formula: C44H40O26 (B) empirical formula: C22H20O13； molecular formula: C22H20O13 (C) empirical formula: C44H40O26； molecular formula: C22H20O13 (D) empirical formula: C26H20O10； molecular formula: C26H20O10 (E) empirical formula: C26H20O10； molecular formula: C52H40O20

90. What monomer(s) is/are needed to synthesize the polymer shown below? I. HOCH2CH2OH II. HOOCCH2CH2COOH III. HOCH2CH2COOH IV. HOCH=CHOH V. HOOCCH=CHCOOH (A) II (B) III (C) I and II (D) IV and V (E) II and III

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其他試題

90. What monomer(s) is/are needed to synthesize the polymer shown below?
I. HOCH₂CH₂OH II. HOOCCH₂CH₂COOH III. HOCH₂CH₂COOH IV. HOCH=CHOH V. HOOCCH=CHCOOH
(A) II
(B) III
(C) I and II
(D) IV and V
(E) II and III