12. Which of the following molecular formulae has the most structural isomers, all containing a hydroxyl group?
(A)C₃H₆O
(B) C₃H₈O
(C) C₄H₈O
(D)
(E)

13. Which of the following statements about the dominant Lewis structures ofis correct? (A) ClO obeys the octet rule. (B) ClO- has 1π bond. (C) has 8 lone pair electrons. (D) has 2 π bonds. (E) has 10 lone pair electrons

14. Which of the following statements about the van der Waals equation is incorrect? (P+■)(V-□)=nRT (A) The van der Waals equation describes the behavior of real gases. (B) ■ =n2a/V2 and is used to compensate for the attraction force bctwecn gas molecules. (C) □= nb and is used to correct the volume of real gases. (D) ■is negative for most gases. (E)□  is positive for most gases.

15. If the reaction starts with only 1 mole of A and 1 mole of B in a 1.0 L sealed reaction vessel, the equilibrium constant of this reaction is K. Which of the following statements is correct? (A) The expression for K of this reaction is ([C]2[D])([A][B)3). (B) If K = 1, [A] is 0.5 M at equilibrium. (C) If K= 1, [C] is 0.3 M at equilibrium. (D) If [C] = 0.5 M at equilibrium, K = 0.08. (E) If [D] 0.25 M at equilibrium, K = 0.17.

16. Which of the following comparisons for the acidity of the following species in an aprotic solvent is correct? (A) Acidity: (B) Acidity: NaNH2＞ NH3 (C) Acidity: (D) Acidity: CH3OH >NH4CI (E) Acidity: C6H5OH ＞ (CH3)3COH

17. Which of the following compounds (1-5) is optically active?(A)1 (B) 2 (C) 3 (D) 4 (E) 5

18. Which of the following compounds (6-10) is chiral?  (A)6 (B)7 (C) 8 (D) 9 (E) 10

19. Which of the following compounds (11-15) is not monosaccharide? (A)11 (B) 12 (C) 13 (D) 14 (E) 15

20. Each of the longest wavelength of the spectral lines recorded for two electron transitions from n = 2 and n = 4 of hydrogen atoms is X and Y, respectively. What is the relationship between X and Y? (A) X:Y = 11:34 (B) X:Y = 5:4 (C) X:Y= 1:4 (D) X:Y = 5:144 (E) X:Y=7:108

21. As shown in Fig, 1, a container with a frictionless movable partitions fixed volume at constant temperature is divided into three compartments (A, B, Hz and C) by two partitions, which are movable without friction. Compartments A and C are filled with an equal amount of mass of gas X and Y. When two partitions stop sliding, the density of X is equal to that of Y. Which of the following statements is correct?  (A) Volume of gas: V(X) ＞ V(H2) ＞ V(Y) (B) Number of moles of gas: n(X) ＜n(H2) ＜n(Y) (C) Number of moles of gas: n(X) = n(H2) = n(Y) (D) The molecular mass of X is equal to the molecular mass of Y. (E) The molecular mass of X is smaller than the molecular mass of Y.

22. Which of the following groups of species can coexist in significant amounts in a given solution at room temperature? (A) A solution that turns methyI orange red contains . (B) A solution that turns phenolphthalein red contains , and. (C) 0.1 M AgNO3 solution contains , and I-. (D) 0.1 M Na[Al(OH)4] solution contains H+, Na+, CI-, and. (E) An acidic potassium permanganate solution contains , and glucose.

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