5. Vulcanization is a process to strengthen natural rubber by crosslinking polymer chains  with what element? 
(A) sodium
(B)titanium
(C)sulfer
(D) phosphorus
(E)aluminum

3. Esters and amides are the most easily made by nucleophilic acyI substitution reactions on: (A) alcohols (B)acide anhydrides (C) carboxylates (D) carboxylic acids(E) acid chlorides 

4. An organic compound A is formed by the reaction of ethylmagnesium iodide with a substance B, followed by the treatment with dilute aqueous acid. Compared A does not react with pyridinium chlorochromate in dichloromethane. Which one the following is a possible candidate for B? (A) CH3CHO (B) CH3CH2OH (C) CH3CH2COCH3(D) HCO2CH3

6. Epoxide undergoes ring-opening reaction with water to generate (A) glycol (B)glyoxal (C)ester alcohol (D)none of above

複選題7. For isobutanol: (A) it is a primary alcohol (B) it is a constitutional isomer of cyclobutanol (C) it shows a characteristics absorption at in IR spectrum (D) it shows four carbon signals in the NMR spectrum.

8. Which one of following structures has the lowest pKa?(A)(B)(C)(D)(E)

9. Which description about the frontier molecular orbital theory is False? (A) HOMO is an acronym for highest occupied molecular orbital. (B) Antibonding molecular orbitals are higher in energy than the isolated atomic orbitals from which they made. (C) The LUMO of 1,3-butadiene has one node. (D) The HOMO of allyl anion has one node. (E) The thermal [2+2] cycloaddition of two ethylenes to give cylobutane is a symmetry-forbidden reaction.

10. Which of following addition reactions of alkenes occur specifically in an anti- fashion: (A) Dihydroxylation using OsO4, H2O2 (B) Addition of Br2 (C) Hydroboration-oxidation (D) Hydrogenation using H2-Pt

11. The conversion of 2-pentanone to butanoic acid is best accomplished with: (A) I2, NaOH (B) NaBH4 (C) CrO3 (D) Ag20

12. A molecule has three degrees of unsaturation. In this molecule there would be (A) three rings (B) three double bonds (C) two rings and one double bond (D) one ring and two double bonds (E) any of the above

13. What is the IUPAC name of the following compound? (A)( E )-3-methylpent-3-ene (B) (Z)-3-methylpent-3-ene (C) ( E )-3-methylpent-2-ene (D) (Z)-3-methylpent-2-ene

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