What is the correct order of reactivity of ha | vedclass

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

Question

(B) The $S_{N}2$ reaction mechanism is highly sensitive to steric hindrance. The reactivity order for $S_{N}2$ is: $Primary > Secondary > Tertiary$. H

Vedclass · Accepted Answer

$(CH_3)_2CHX < CH_3CH_2X < CH_2=CH-CH_2X < PhCH_2X$

Vedclass · Answer

(B) The $S_{N}2$ reaction mechanism is highly sensitive to steric hindrance. The reactivity order for $S_{N}2$ is: $Primary > Secondary > Tertiary$. However,allylic $(CH_2=CH-CH_2X)$ and benzylic $(PhCH_2X)$ halides are highly reactive in $S_{N}2$ reactions due to the stabilization of the transition state by resonance. Comparing the given compounds: $1$. $(CH_3)_2CHX$ is a secondary halide (least reactive). $2$. $CH_3CH_2X$ is a primary halide. $3$. $CH_2=CH-CH_2X$ (allyl halide) and $PhCH_2X$ (benzyl halide) are more reactive than primary halides due to resonance stabilization of the transition state. Between allyl and benzyl,the benzyl group is generally more reactive due to extended conjugation. The correct order is: $(CH_3)_2CHX < CH_3CH_2X < CH_2=CH-CH_2X < PhCH_2X$.

What is the correct order of reactivity of halides for the $S_{N}2$ reaction?

Similar Questions

Identify the statement which is not correct?

Which chlorine atom is more electronegative in the following compounds?

The reaction $RCl + NaI \xrightarrow{\text{Acetone}} R-I + NaCl$ is known as:

The major product obtained in the given reaction is:

Chloroethane with silver acetate forms $X$ and with $LiAlH_4$ forms $Y$. What are $X$ and $Y$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module