Statement - I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow SN2 mechanism.Statement - II: A secondary alkyl halide when treated with a large excess of ethanol follows SN1 mechanism.
Question
Statement - I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow SN2 mechanism.Statement - II: A secondary alkyl halide when treated with a large excess of ethanol follows SN1 mechanism.
Solution
Statement I: This is correct. The SN2 mechanism is a type of nucleophilic substitution, where a nucleophile (a chemical species capable of donating an electron pair) reacts with an electrophilic carbon. The reaction rate is influenced by the concentration of both the nucleophile and the substrate. In the case of a strong nucleophile and a secondary alkyl halide without bulky substituents, the reaction is likely to proceed via the SN2 mechanism. This is because the nucleophile can easily approach the electrophilic carbon, and the reaction can occur in a single step.
Statement II: This is also correct. The SN1 mechanism is another type of nucleophilic substitution, where the rate of reaction is influenced only by the concentration of the substrate. In this case, a secondary alkyl halide treated with a large excess of ethanol is likely to follow the SN1 mechanism. This is because the alkyl halide first dissociates to form a carbocation, which is then attacked by the nucleophile. The large excess of ethanol ensures that the nucleophile is always present in sufficient quantity to react with the carbocation.
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.
Arrange the following alkyl halides in the decreasing order of the SN1 reactivity.(I) CH3CH2CH2Cl (II) CH2=CH-CH(Cl)CH3 (III) CH3CH2CH(Cl)CH3(a) I>II>III (b) II > I > III (c) II > III > I (d) III > II > I
Four alkyl halides: bromomethane, 2-bromobutane, 2-bromo-2-methylpropane, and 1-bromobutane, each react with water through solvolysis by an SN1 reaction in which the solvent acts as the nucleophile. In what order will these alkyl halides react to form alcohols, from fastest to slowest?A.bromomethane → 1-bromobutane → 2-bromobutane → 2-bromo-2-methylpropaneB.bromomethane → 1-bromobutane → 2-bromo-2-methylpropane → 2-bromobutaneC.2-bromo-2-methylpropane → 2-bromobutane → 1-bromobutane → bromomethaneD.2-bromobutane → 2-bromo-2-methylpropane → 1-bromobutane → bromomethane
Statement (I) : SN2SN2 reactions are 'stereospecific', indicating that they result in the formation of only one stereo-isomer as the product.Statement (II) : SN1SN1 reactions generally result in formation of product as racemic mixtures.In the light of the above statements, choose the correct answer from the options given below :JEE Main 2024 (08 Apr Shift 2)ABoth Statement I and Statement II are falseBStatement I is false but Statement II is trueCStatement I is true but Statement II is falseDBoth Statement I and Statement II are true
Which solvent has the lowest energy of activation for an SN1 reaction?Select answer from the options belowAcetoneHexaneEthanolHMPA
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