77. What is the major product of the following reaction?
(A)
(B)
(C)
(D)
(E)

73. In order to synthesize the final product shown below, predict when should a protecting group be added and when should it be removed? (A) The hydroxyl group should be protected before step I and removed after step I (B) The hydroxyl group should be protected before step I and removed after step II (C) The hydroxyl group should be protected before step I and removed after step III (D) The hydroxyl group should be protected before step II and removed after step III (E) There is no need for a protecting group in this synthesis.

74. Which of the following Diels-Alder reactions has the largest reaction rate constant? (A) (B) (C) (D) (E)

75. What is the product of this reaction? ?(A) (B) (C) (D) (E)

76. What is the major product obtained from the following reaction sequence? (A) (B) (C) (D) (E)

78. Which of the following reactions is called Gabriel synthesis? (A) (B) (C) (D) (E) None of the above.

79. What is the major product of the following triene to undergo the intramolecular Diels-Alder reaction? (A) (B) (C)  (D) (E)

80. The following reaction involves an intramolecular Michael reaction followed by an intramolecular aldol reaction. What is the major product of this reaction? (A) (B) (C) (D) (E)

1. 有關植物細胞伸長的主要特徵，下列敘述何者正確？ (A)原生質增加(B)細胞的體積增加與液泡化 (C)大量吸收礦物質元素(D)有機物增加

2. 試問菊花某種細胞間隙的水勢為甲，細胞液水勢為乙，細胞質基質水勢為丙，當該細胞因缺 水而萎凋時，上述三種水勢之間的關係為何？ (A)甲＞乙＞丙(B)甲＞丙＞乙 (C)乙＞丙＞甲(D)乙＞甲＞丙

3. 有關植物「水分臨界期」的說明，下列敘述何者正確？ (A)植物對水分缺乏最敏感的時期 (B)植物對水分需要最多的時期 (C)植物對水分利用率最高的時期 (D)植物對水分需求由低至高的轉折時期