最近在练习综合化学的考古题 不过由於没有答案 都和几个一起读书的朋友讨论 有些讨论不出来的 想来问问板上的板友们 希望可以帮帮忙!! 先感谢一下! =============以下问题开始========== 1.An increase in comjugation is correlated with _____ in the energy of the LUMO,_____ in the energy of the HOMO,and _____in 入(MAX) (A)a decrease,an increase,a decrease (B)a decrease,an increase,an increase (C)an increase,a decrease,a decrease (D)an increase,a decrease,an increase (E)an increase, an increase,a decrease 这题连题目都不懂再说什麽......还有那个入是波长那个符号 可是我不会打.... 2.Which of the following compounds possesses the so called "three-center bond" (A)solid BeCl4 (B)PCl3 (C)solid BeH2 (D) PH3 不是只有B有"three-center bond"吗@@? 3.Which one of the following type of elements is most likely to be a good oxidizing agent? (A)alkali mentals (B)transition mentals (C)lanthanides (D)halogens 4.Which of the following extraction technique usually uses the least amount of solvent to extract organic substance? (A)soxhlet extraction (B)microwave assisted extraction (C)solid phase microextraction (D)sonication assisted extraction 这题也是不知道在说什麽..... 5.The rate law for a reaction is found to be rate=k[a]2[b] <==速率式的2是平方 which of the following mechanisms gives this rate law? a. A+B --> E (FAST) <-- E+B ---> C+D (SLOW) b. A+B --> E (FAST) <-- E+A ---> C+D (SLOW) c. A+A ---> E (SLOW) E+B ---> C+D (FAST) (A)a (B)b (C)c (D) a and b (E)none of the above 6.最後这是我自己不是很懂得一个地方, 就是有机的立体化学中 configurational isomer和 diastereomer 两个的差别是在哪边?看了很久还是不懂 有没有版有可以解释一下 或是举个例子都可以!! 感谢!!! --

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