33. Which of the following acids or solvents is most suitable to clean Si wafer exposed to air?
(A) CH₂Cl₂
(B) C₆H₁₄
(C) HF
(D) HNO₃
(E) H₂SO₄

1. How many structural isomers does propane have? (A) 3 (B) 2 (C) 1 (D) 5 (E) 4

2. The product of ethane undergoing dehydrogenation is called (A) propene. (B) methene. (C) ethene (D) propane (E) none of these

3. When C4H8 is treated with water and H2SO4, a tertiary alcohol is produced. Which of the following structures could represent C4H8 in this reaction? (A) CH3CH=CHCH3 (B) CH3CH2CH=CH2 (C) CH3C(CH3)=CH3 (D) CH3CH2CH2CH3 (E) none of these

4. With which of the following do alkanes react? (A) boiling nitric acid (B) the strong oxidizing agent KMnO4 (C) boiling aqueous sodium hydroxide to give alcohols (D) concentrated sulfuric acid (E) oxygen to give carbon dioxide and water

5. Which of the following have a cis configuration? (A) 2 (B) 1 and 2 (C) 2 and 4 (D) 1, 2, and 4 (E) 1 and 4

6. Which of the following compounds is the strongest acid? (A) 5 (B) 3 (C) 2 (D) 1 (E) 4

7. Consider the compound below. Which of the following is true? (A) The compound has geometric isomers. (B) The compound is not chiral. (C) The compound exists as 3 stereoisomers. (D) The compound is chiral and does not have geometric isomers. (E) The compound is chiral.

8. Which of the following undergo nitration faster than benzene? (A) 4 and 5 (B) 2, 3, and 5 (C) 1 and 2 (D) 3 and 4 (E) 1, 4, and 5

9. Table sugar is a disaccharide formed from (A) alpha-D-glucose and fructose. (B) beta-D-glucose and fructose. (C) D-galactose and D-ribose. (D) D-galactose and fructose. (E) none of these

10. Polystyrene is an addition polymer of styrene. What would be the effect if some divinylbenzene were added to styrene and then polymerized? (A) The second polymer would be made less flammable than pure polystyrene. (B) The polymer would be more flexible. Divinylbenzene acts as a plasticizer. (C) Divinylbenzene would act as a cross-linking agent, making the polymer stronger. (D) There would be no effect on the properties of the polymer. (E) There would be an effect, but it cannot be predicted.

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