Which of the following S_N2 reactions is the | vedclass

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(B) The rate of an $S_N2$ reaction depends on the steric hindrance around the electrophilic carbon and the nucleophilicity of the attacking species.$1

Vedclass · Accepted Answer

$CH_3-CH_2-CH(Br)-CH_3 + H_2O \rightarrow$

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(B) The rate of an $S_N2$ reaction depends on the steric hindrance around the electrophilic carbon and the nucleophilicity of the attacking species.$1$. Steric hindrance: Primary alkyl halides $(1^{\circ})$ react faster than secondary alkyl halides $(2^{\circ})$ in $S_N2$ reactions.$2$. Nucleophilicity: $A$ strong nucleophile like $OH^{\ominus}$ reacts much faster than a weak nucleophile like $H_2O$.Comparing the options:- Options $A$ and $C$ involve $OH^{\ominus}$ (strong nucleophile).- Options $B$ and $D$ involve $H_2O$ (weak nucleophile).- Between $B$ and $D$,$B$ is a secondary alkyl halide $(2^{\circ})$ while $D$ is a primary alkyl halide $(1^{\circ})$.- Since $S_N2$ is highly sensitive to steric hindrance,the secondary alkyl halide $(B)$ will react slower than the primary one $(D)$ when using the same weak nucleophile.- Therefore,the reaction of a secondary alkyl halide with a weak nucleophile $(H_2O)$ is the slowest.

Which of the following $S_N2$ reactions is the slowest?

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