20. What final product would be obtained from following reaction??

16. What major product would be obtained from following reaction??

17. What major product would be obtained from following reaction?  ? 

18. What major product would be obtained from following reaction??

19. What final product would be obtained from following sequential reactions??

21. Which one is the correct IUPAC name for the following compound? (A) （E）-3,3-Dimethyl-4-propylocta-1,5-diene (B) （E）-6,6-Dimethyl-5-propylocta-3,7-diene　(C) （Z）-3,3-Dimethyl-4-propylocta-1,5-diene　(D) （Z）-3,3-Dimethyl-4-propylhepta-1,5-diene.

22. What major product would be obtained from following reaction?

23. What final product would be obtained from following reaction??

24. Which statements describe the bonding in the water molecule?  1. polar covalent  2. π bond  3. sp3 hybridization(A) 1 only (B) 1 and 2 only (C) 1 and 3 only (D) 2 and 3 only

25. In the following SN2 reaction which one would be predicted to be the fastest? (A) H2O + CH3Br → HOCH3 + HBr(B) OH- + CH3Br→ HOCH3 + Br-(C) H2S + CH3Br→  HSCH3 + HBr (D)SH- + CH3Br → HSCH3 + Br

26. Bis(2-ethylhexyl)phthalate, commonly abbreviated DEHP, is an organic compound with the formula C6H4(C8H17COO)2. It is sometimes called dioctyl phthalate and abbreviated DOP. Being produced on a massive scale by many companies, it has acquired many names and acronyms, including BEHP and di-2-ethylhexyl phthalate. Recently, the illegal use of the plasticizer DEHP in clouding agents for use in food has been reported in Taiwan, what is the structure of DEHP?