Question

Select the properties of the Sn2 reaction mechanism. stereospecific: 100% inversion of configuration at the reaction site not stereospecific bimolecular at rate-determining step unimolecular at rate-determining step first order second order rate is governed by steric effects rate is governed by the stability of the carbocation that is formed

Select the properties of the SN2 reaction mechanism.

Answer 1

Concepts and reason

S_N2 reaction is a nucleophilic substitution reaction. Here, the number 2 indicates bimolecular. The nucleophile attacks from the opposite side of the leaving group. Hence, it gives inversion of configuration.

Fundamentals

S_N2 reaction is a single step reaction. The rate of the reaction depends on both concentration of substrate and concentration of nucleophile. S_N1 reaction is a two-step reaction. The rate of the reaction in S_N1 depends only on the concentration of substrate.

Molecularity is the number of molecules that are present in a rate determining step. That is the sum of the stoichiometric coefficients of the reactants in the rate determining step.

The rate of the reaction depends on both concentration of substrate and concentration of nucleophile. Hence, it is second order reaction and its molecularity is 2.

In S_N2 reaction mechanism, as the bond between leaving group and the substrate weakens, the bond between the incoming nucleophile and the substrate forms. Hence, the rate of the reaction decreases, as the steric hindrance increases. Therefore, rate is governed by steric effects.

The nucleophile attacks from the opposite side of the leaving group. Hence, 100% inversion of configuration takes place at the reaction site. That means it is stereospecific.

Hence, the correct options are as follows:

stereospecific: 100% inversion of configuration at the reaction site

bimolecular at rate-determining step

second order

rate is governed by steric effects

Ans:

Select the properties of S_N2 reaction mechanism as follows: