Statement - I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow SN2SN2 mechanism.Statement - II: A secondary alkyl halide when treated with a large excess of ethanol follows SN1SN1 mechanism.In the the light of the above statements, choose the most appropriate from the questions given below:JEE Main 2024 (30 Jan Shift 2)AStatement I is true but Statement II is false.BStatement I is false but Statement II is true.CBoth statement I and Statement II are false.DBoth statement I and Statement II are true.
Question
Statement - I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow SN2SN2 mechanism.Statement - II: A secondary alkyl halide when treated with a large excess of ethanol follows SN1SN1 mechanism.In the the light of the above statements, choose the most appropriate from the questions given below:JEE Main 2024 (30 Jan Shift 2)AStatement I is true but Statement II is false.BStatement I is false but Statement II is true.CBoth statement I and Statement II are false.DBoth statement I and Statement II are true.
Solution
The answer is A. Statement I is true but Statement II is false.
Here's why:
Statement I: This is true. The SN2 mechanism is a one-step process where the nucleophile attacks the substrate and the leaving group leaves simultaneously. This mechanism is favored by strong nucleophiles and less sterically hindered substrates, such as secondary alkyl halides without bulky substituents.
Statement II: This is false. The SN1 mechanism is a two-step process where the leaving group leaves first to form a carbocation, which is then attacked by the nucleophile. This mechanism is favored by weak nucleophiles and more sterically hindered substrates. However, a large excess of ethanol, which is a weak nucleophile, would not favor the SN1 mechanism with a secondary alkyl halide. Instead, it would favor the SN2 mechanism because ethanol can act as a nucleophile and attack the less hindered carbon in the secondary alkyl halide.
Similar Questions
Which of the following statements is NOT supported by the results in Tables 1 and 2?A.In Experiment 2, crotyl chloride forms a stable carbocation.B.Primary alkyl halides react more readily in SN2 reactions than in SN1 reactions.C.Nucleophilic substitution reactions are not dependent on the substrate (alkyl halide) substitution.D.Bromide is a better leaving group than chloride and enhances reactivity in less favorable reactions.
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