Activity 6 CHEM 241 Please circle the best answer for following questions: 1. So

Question

Activity 6 CHEM 241 Please circle the best answer for following questions: 1. Solvolysis a) the solvent acts as the substrate. c) the solvent dissociates the substrate. b) solvent acts as the nucleophile. the d) the solvent traps the counter-ion. 2. What happens to the rate of an sw1 reaction if the nucleophile concentration is doubled? a) The reaction rate c) The reaction rate increases b) The reaction rate is halved. by four times. d The reaction rate is unaffected. 3. Which statement is TRUE about an SN2 reaction? a) It involves a carbocation intermediate. c) It has two transition states. c) It can work with a polar aprotic solvent. d) None of the above. 4. Which substitution reaction below is the most favorable? a) Methyl bromide HS b) Methyl fluoride HS c) Methyl bromide NHs d) Methyl fluoride NHs 5. The formula for a substitution reaction is a) a weak base always substitutes for a strong base. b) a strong base always substitutes for a weak base. c) a weak base alvways serves as a poor leaving group. d) a strong base always serves as a good leaving group. 6. With two chiral centers present, which pair of these stereoisomers is a pair of enantiomers? a) (S,R) & (S,S) b) (R,R) & (R,s) c (RS) & (SAR) d) (SS) & (RS) 7. Which statement is true about an SN1 reaction? a) It has Walden inversion. b) It needs to have a strong base as a nucleophile. c) It is a two-step reaction. d) A methyl halide is the best for SN1 reaction. 8. Which one can be the best nucleophile as below? a) NaOCH b) H20 c) CH3OH d) NH(CH)2 9. What is the purpose of adding crown ether like 18-crown 6 ether to a substitution reaction? a) It makes the substrate to lose its leaving group easier. b) It makes the electrophilic carbon of the substrate to be more electrophilic. c) It causes the nucleophile to have an extra pair of electrons.

Explanation / Answer

1) A solvolysis reaction is one where the solvent itself behaves as a nucleophile. Solvents like water and alcohols are particularly undergoes solvolysis reaction.

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