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• 28.Which of the following statements is correct?(A)A structure with two chiral centers will always g
• 27.Diastereomers have the same(A)melting point. (B)reaction rate toward optically active reagent. (C
• 30.Of the following sets of four quantum numbers, identify the ones that can exist for an electron i
• 26.Arrange in decreasing order of stability of the following four isomers.(I)cis-1-chloro-2-methylcy
• 32.Which of the following statements correctly describes an achiral molecule?(A)The molecule has a n
• 21. 若a、b兩數滿則102a+1 = 1000b-1 = 1000000000，則a+b=?(A)8(B)15(C)25/2(D)43/6
• 34.According to the VSEPR theory, which of the following statements is correct?(A) The expected geom
• 35.Which of the following statements is correct?(A)In O2, O22-, O2-, and O2+ species, only the O22-m
• 37.Which of the following statements is not true?(A)trans-1,3-dimethylcyclohexane is more stable tha
• 38.The approximate pKaof NH3 is 36; that of C2H5OH is 16. From this information, which (if any) of t
• 31.How many constitutional isomers are there for C5H11Br?(A)3 (B)7 (C)8 (D)10 (E)11.
• 39.The activation energy(Eact) of a give reaction is unrelated to which of the following parameters?
• 29.Who characterized alpha, beta and gamma radiation?(A)Thomson (B)Einstein (C)Rutherford (D)Heisenb
• 33.Which of the following molecules has the highest bond order?(A)BN (B)CO (C)NO (D)Ne2 (E)F2
• 41.Thiols are alcohol analogs in which the oxygen has been replaced by sulfur (e.g., CH3SH). Given t
• 42.Rank the transition states which occur during the following reaction steps in order of increasing
• 36.Which of the following atoms is paramagnetic?(A)Cd (B)Tl1-(C)Nb1+ (D)Ni (E)Ru1+
• 43.An alkane with a molecular formula C6H14 reacts with chlorine in the presence of light and heat.
• 46.In the traction of a reagent such as HBr with an alkene, the frist step of the reaction is theto
• 47.Markovnikov’s rule “works” because:(A)The most stable transition state is the one leading to the
• 45.The product from the reaction of 1-pentene with Cl2 in H2O is named:(A)1-Chloro-2-pentanol (B)2-C
• 48.Treatment of 2-methyl-2-butene with HBr in the presence of peroxide yields(A)A primary alkyl brom
• 40.Which of the following is least able to serve as a nucleophile in a chemical reaction?(A)Br-(B)OH
• 49.The strongest evidence for the formation of a bridged bromonium ion as an intermediate in the add
• 50.A compound having a molecular formula of C20H36 is inert to catalytic hydrogenation. Which of the