85. Given the compound as shown below:

Which of the labeled H atoms (1-5) in the following molecule would be predicted to be the most acidic?
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

81. Which of the following cycloalkenes would be expected to be stable?(A) f and ff (B) ff and fff (C) ff (D) f and fff (E) All are stable.

82. What is the structural relationship of the following two compounds?(A) same compound (B) enantiomers (C) cis-trans isomers(D) structural isomers (E) diastereomers

83. Two complex ions containing Ni are , which is blue, and , which is purple.Which one of these statements is correct? (en = H2N–CH2–CH2–NH2)(A) The wavelength of the light absorbed by is greater than the wavelength absorbedby .(B) The energy of the photon absorbed by [Ni(en)3]2+ is greater than that absorbed by.(C) Both complex ions are diamagnetic.(D) absorbs light in the violet region of the spectrum.(E) The crystal field splitting energy () is greater for than for .

84. Which of the following becomes more soluble in water upon addition of NaOH?(A) an amine (B) a carboxylic acid (C) a phenol(D) an alkane (E) two of these

86. Which of the following compounds exhibits the highest stability?(A) 2-methyl-1,2-pentadiene (B) (Z)-2-methyl-1,3-pentadiene(C) （E）-2-methyl-1,3-pentadiene (D) 2-methyl-2,3-pentadiene(E) 2-methyl-1,4-pentadiene

87. A metal fluoride crystallizes in a close-packed arrangement of fluoride ions, with the metal ions occupying one-half of the octahedral holes. What is the formula of this compound?(A) MF (B) MF2 (C) MF3 (D) M2F (E) M2F3

88. As indicated by Lewis structures, which of the following species could not comply with the octet rule?  I. NO; II. NO2; III. N2O4; IV. CO; V. CH3NC(A) f and II (B) II, III, and V (C) I, III, and V(D) I, II, III, and V (E) I, II, and V

89. fdentify the major product of the reaction below.(A)(B)(C)(D)(E)

90. ff a 20.0 g sample of CaCO3 is put into a 20.0 L container and heated to 800℃, what the mass percentage of the CaCO3 will react to reach equilibrium? (Ca=40.08 g/mol), = 1.16 at 800℃(A) 100% (B) 76% (C) 50% (D) 24% (E) 13%

1. B 公司 X7 年 5 月 1 日支付一年期租金費用$36,000，支付租金當天會計分錄為借記「租金費用」$36,000，貸記「現金」$36,000，則 X7 年 12 月 31 日關於租金費用的正確調整分錄為何？ (A)借記「租金費用」$12,000 (B)貸記「現金」$24,000 (C)借記「預付租金」$12,000 (D)貸記「租金費用」$24,000