Which compound undergoes nucleophilic substit | vedclass

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

Question

(A) The reaction with $NaCN$ typically proceeds via the $S_N2$ mechanism,as $CN^-$ is a strong nucleophile.The rate of $S_N2$ reaction is inversely pr

Vedclass · Accepted Answer

$CH_3CH_2CH_2CH_2Br$

Vedclass · Answer

(A) The reaction with $NaCN$ typically proceeds via the $S_N2$ mechanism,as $CN^-$ is a strong nucleophile.The rate of $S_N2$ reaction is inversely proportional to the steric hindrance at the reaction center.The order of reactivity for $S_N2$ is: primary $(1^\circ)$ > secondary $(2^\circ)$ > tertiary $(3^\circ)$.Comparing the given compounds:$(A)$ $CH_3CH_2CH_2CH_2Br$ is a primary alkyl halide $(1^\circ)$.$(B)$ $CH_3CH_2CH(CH_3)Br$ is a secondary alkyl halide $(2^\circ)$.$(C)$ $(CH_3)_2CHCH_2Br$ is a primary alkyl halide $(1^\circ)$,but it has steric hindrance at the $\beta$-carbon.$(D)$ $CH_3CH_2C(CH_3)_2Br$ is a tertiary alkyl halide $(3^\circ)$.Among the primary halides,$CH_3CH_2CH_2CH_2Br$ has the least steric hindrance at the reaction center,making it the fastest to undergo $S_N2$ substitution.

Which compound undergoes nucleophilic substitution with $NaCN$ at the fastest rate?

Similar Questions

How many different products are formed from the $E_2$ elimination reaction of the following alkyl iodide?

Compound $(A), \, C_8H_9Br,$ gives a white precipitate when warmed with alcoholic $AgNO_3.$ Oxidation of $(A)$ gives an acid $(B), \, C_8H_6O_4.$ $(B)$ easily forms anhydride on heating. Identify the compound $(A).$

Haloalkanes react with $KCN$ to form alkyl cyanides as the main product,while $AgCN$ forms isocyanides as the chief product. Explain.

Observe the following reactions:
$1$. $C_6H_5-CH=CH_2 + HBr \rightarrow X$
$2$. $C_6H_5-C(CH_3)=CH_2 + HBr \rightarrow Y$
$3$. $C_6H_5-CH=CH_2 + HBr \xrightarrow{(C_6H_5COO)_2} Z$
The correct order of reactivity of $X, Y, Z$ towards $S_N1$ reaction is:

In the dehydrohalogenation of $2$-bromobutane,which conformation leads to the formation of $cis$-but-$2$-ene?

Vedclass Test Series

Exam Paper Generator

Online Exam Module