The half life for the reaction of methyl bromide with a nucleophile is found to
ID: 483976 • Letter: T
Question
The half life for the reaction of methyl bromide with a nucleophile is found to be about 30 minutes, while the half life for the reaction between the same molecule and neopentyl bromide is found to be about 2000 years. Which of the following statements is true regarding these observations?
a. the rate constant for the reaction with neopentyl bromide is larger than the rate constant for the methyl bromide reaction
b. steric factors, relating to the shape of the neopentyl bromide are largely responsible for its slow reaction with the nucleophile
c. in 120 minutes, the methyl bromide concentration is zero because all of it will have reacted with the nucleophile
d. none of these statements is correct regarding the situation
Explanation / Answer
Answer:- B
We know that larger the value of rate constant smaller is half life and vice versa for iind order reactions like SN2 which is considered over here.
Large half life of neopentyl bromide suggest that it reacts very slowly which is due to the steric factor as bulky groups are present.
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