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(B) The rate of $S_{N^1}$ reaction depends on the stability of the carbocation intermediate formed after the leaving group departs.$1$. Compound $1$ i

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$2 < 3 < 4 < 1$

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(B) The rate of $S_{N^1}$ reaction depends on the stability of the carbocation intermediate formed after the leaving group departs.$1$. Compound $1$ is an allylic bromide. Upon loss of $Br^-$,it forms a stable allylic carbocation.$2$. Compound $2$ is a vinylic bromide. Vinylic halides are extremely unreactive towards $S_{N^1}$ because the resulting vinylic carbocation is highly unstable due to the $sp$ hybridization of the carbon atom.$3$. Compound $3$ is an allylic chloride. It forms an allylic carbocation,but $Cl^-$ is a poorer leaving group than $Br^-$,making it less reactive than $1$.$4$. Compound $4$ is an allylic bromide. It forms a secondary allylic carbocation. Comparing $1$ and $4$,$1$ forms a more substituted (more stable) allylic carbocation than $4$.Thus,the order of stability of carbocations (and reactivity) is $2 < 3 < 4 < 1$.

List-$I$	List-$II$
$A$. Finkelstein reaction	$I$. $SbF_3$
$B$. Swarts reaction	$II$. $Na$, dry ether
$C$. Sandmeyer's reaction	$III$. $NaI$
$D$. Fittig reaction	$IV$. $Cu_2Cl_2$

Arrange the following reactants in increasing order of reactivity towards $S_{N^1}$ solvolysis reaction with methanol.

Similar Questions

Assertion : Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason : Alkyl halides are less reactive than acyl halides.

When $32.25 \ g$ of ethyl chloride undergoes dehydrohalogenation,it yields $50\%$ of the theoretical alkene product. What is the mass of the product obtained in $g$? (Atomic mass: $Cl = 35.5, C = 12, H = 1$)

Match the List-$I$ with List-$II$:
List-$I$ List-$II$
$A$. Finkelstein reaction $I$. $SbF_3$
$B$. Swarts reaction $II$. $Na$, dry ether
$C$. Sandmeyer's reaction $III$. $NaI$
$D$. Fittig reaction $IV$. $Cu_2Cl_2$

Choose the correct answer from the options given below:

When $but-3-en-2-ol$ reacts with aqueous $HBr$,the product formed is:

Product $(s)$ formed during this reaction is/are

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