1. What change would you expect on the rate of the S N 2 reaction of 1-iodo-2-me
ID: 921902 • Letter: 1
Question
1. What change would you expect on the rate of the SN2 reaction of 1-iodo-2-methylbutane with cyanide ion if the nucleophile concentration is halved and the alkyl halide concentration is halved?
Possible answers: divided by 4, halved, no effect, increased 2x, increased 3x, increased 6x, increased 9x
2. What change would you expect on the rate of the reaction of ethanol with 2-iodo-2-methylbutane if the nucleophile concentration is unchanged and the alkyl halide concentration is tripled?
Possible answers: divided by 4, halved, decreased, no effect, increased 2x, increased 3x, increased 6x, increased 9x
Explanation / Answer
1 ) answer : divided by 4
2) answer : increased 3x
explanation:
1) SN2 reaction : rate = k [RX] [nucleophile]
= k [RX /2 ] [nucleophile / 2]
= rate / 4
2) rate = k [RX]
= k [3 RX]
= 3 rate
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