S, 2 Reaction: DMF For the SN2 reaction shown above, indicate the effect that ea
ID: 551146 • Letter: S
Question
S, 2 Reaction: DMF For the SN2 reaction shown above, indicate the effect that each change will have on the RATE of the reaction. Answers are either: rate will increase (), rate will decreasse (D), or reaction rate will show no change (NC) Enter I, D, or NC in each blank. 1. The concentration of the nucleophile (MeS-) increases. 2. The electrophile is changed from 1-bromobutane to 2-bromobutane. 3. The temperature is reduced. 4. The nucleophile is changed from MeS to Me2P 5. The nucleophile is changed to Et-S-H 6. The concentration of the electrophile decreases.Explanation / Answer
SN2-mechanism
rate = k[R-Br][Nu-]
so that, rate of reaction is directly proportional to con.of R-Br,Nu-
order of reactivityof R-Br : 1>2>3
1. rate will increases = I
2. rate will decreases = D
3. rate will decreases = D
4. rate will show no change = NC (me2P- is a nucleophile)
5. rate will decreases = D (Et-S-H is a weak nucleophile)
6. rate will decreases = D
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