Which one of the following compounds will be | vedclass

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

Question

(B) The elimination of $HBr$ from a haloalkane (dehydrohalogenation) typically proceeds via an $E2$ mechanism,which is facilitated by the presence of

Vedclass · Accepted Answer

$Br-CH_2-CH_2-CH_3$

Vedclass · Answer

(B) The elimination of $HBr$ from a haloalkane (dehydrohalogenation) typically proceeds via an $E2$ mechanism,which is facilitated by the presence of an electron-withdrawing group ($-M$ or $-I$ effect) at the $\beta$-carbon. These groups increase the acidity of the $\beta$-hydrogen,making it easier to remove. In the given options: $(a)$ $-NO_2$ is a strong electron-withdrawing group. $(c)$ $-CN$ is a strong electron-withdrawing group. $(d)$ $-CO_2Et$ is an electron-withdrawing group. $(b)$ $-CH_3$ is an electron-donating group (via inductive effect),which decreases the acidity of the $\beta$-hydrogen. Therefore,$Br-CH_2-CH_2-CH_3$ is the least susceptible to elimination.

Which one of the following compounds will be least susceptible to the elimination of hydrogen bromide $(HBr)$?

Similar Questions

In the alkaline hydrolysis of a tertiary alkyl halide by aqueous alkali,if the concentration of the alkali is doubled,then the reaction rate:

Identify $A$ and $B$ in the following reactions:
$A \xrightarrow[\Delta]{aq. NaOH} C_2H_5OH \xleftarrow{AgOH} B$

Which of the following alkyl halides gives only one product (excluding stereoisomers) when undergoing an $E_2$ reaction? $(E_2 = \text{elimination bimolecular})$

What product is obtained when alkyl halides react with metallic sodium in the presence of dry ether?

Which of the following compounds will react with $Na$ to form $4,5-$diethyloctane?

Vedclass Test Series

Exam Paper Generator

Online Exam Module