Consider the nucleophilic attacks given below | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) For $S_N2$ reactions,the rate depends on the strength of the nucleophile and the quality of the leaving group.$(A)$ In pair $A$,$I$ involves $Br^-

Vedclass · Accepted Answer

$A-II; B-III; C-V; D-VIII$

Vedclass · Answer

(C) For $S_N2$ reactions,the rate depends on the strength of the nucleophile and the quality of the leaving group.$(A)$ In pair $A$,$I$ involves $Br^-$ as a leaving group,while $II$ involves $CH_3COO^-$ as a leaving group. Since $Br^-$ is a better leaving group than $CH_3COO^-$,$I$ has a greater $S_N2$ rate.$(B)$ In pair $B$,$III$ uses $SH^-$ (a strong nucleophile) while $IV$ uses $CH_3SH$ (a neutral,weaker nucleophile). Thus,$III$ has a greater $S_N2$ rate.$(C)$ In pair $C$,both reactions occur in $DMSO$ (a polar aprotic solvent). In polar aprotic solvents,nucleophilicity increases as basicity increases. Since $Cl^-$ is more basic than $I^-$,$Cl^-$ is a better nucleophile in $DMSO$. Thus,$V$ has a greater $S_N2$ rate.$(D)$ In pair $D$,the reactions occur in methanol (a polar protic solvent). In polar protic solvents,nucleophilicity increases down the group due to decreased solvation. Thus,$I^-$ is a better nucleophile than $Cl^-$. Therefore,$VIII$ has a greater $S_N2$ rate.Conclusion: The correct choices are $I, III, V, VIII$,which corresponds to option $C$.

Consider the nucleophilic attacks given below. Select the reaction in each pair that shows the greater $S_N2$ reaction rate.

Similar Questions

Identify the correct decreasing order of reactivity of alkyl halides with ammonia.

Which of the following halogen derivatives forms poisonous phosgene gas when it comes in contact with air and light?

What is the product formed when $CH_3-CH=CHBr$ reacts with $HBr$ in the presence of peroxide?

The ease of dehydrohalogenation of alkyl halide with alcoholic $KOH$ is:

What will be the product in the following reaction?
$1$-chloro-$1$-methylcyclohexane $\xrightarrow{H_2O}$ ?

Vedclass Test Series

Exam Paper Generator

Online Exam Module