Chemical Kinetics and Nuclear ChemistryHard
Question
Which reaction will occur at the fastest rate in water
Options
A.CH3Br + CH3 
I → CH3 - I + CH3 OH
I → CH3 - I + CH3 OHB.CH3I + CH3 
Br → CH3 - Br + CH3 OH
Br → CH3 - Br + CH3 OHC.CH3 - Br + CH3 
Cl → CH3 - Cl + CH3 OH
Cl → CH3 - Cl + CH3 OHD.CH3Cl + CH3 
Br → CH3 - Br + CH3 OH
Br → CH3 - Br + CH3 OHSolution
General mechanism will be
In water 3o halide dissociates & shows SN1 mechanism whereas CH3 - X shows (SN2) mechanism.
(CH3)3C - X → (CH3)3C+ + X+
X+ + CH3Y → X - CH3 + Y+
(CH3)3C+ H2O → (CH3)3C - OH
Since I+ is, a good leaving group and a good nucleophile hence reaction ′a′ will be the fastest.
In water 3o halide dissociates & shows SN1 mechanism whereas CH3 - X shows (SN2) mechanism.
(CH3)3C - X → (CH3)3C+ + X+
X+ + CH3Y → X - CH3 + Y+
(CH3)3C+ H2O → (CH3)3C - OH
Since I+ is, a good leaving group and a good nucleophile hence reaction ′a′ will be the fastest.
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