Consider the following carbocations:I. C_6H_5 | vedclass

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

Question

(A) The stability of carbocations is determined by resonance,hyperconjugation,and inductive effects.$I$ $(C_6H_5CH_2^+)$ is a benzylic carbocation,whi

Vedclass · Accepted Answer

$I > III > IV > II > V$

Vedclass · Answer

(A) The stability of carbocations is determined by resonance,hyperconjugation,and inductive effects.$I$ $(C_6H_5CH_2^+)$ is a benzylic carbocation,which is highly stabilized by resonance with the phenyl ring.$III$ $(CH_3-CH^+(CH_3))$ is a secondary $(2^{\circ})$ carbocation,stabilized by hyperconjugation and inductive effects of two methyl groups.$IV$ $(CH_3-CH_2^+)$ is a primary $(1^{\circ})$ carbocation,stabilized by hyperconjugation and inductive effects of one methyl group.$II$ $(CH_2=CH^+)$ is a vinylic carbocation,and $V$ $(HC \equiv C^+)$ is an acetylenic carbocation. Both have the positive charge on an $sp^2$ and $sp$ hybridized carbon,respectively. Higher $s$-character increases electronegativity,making the positive charge less stable.Since $sp$ hybridization ($50\% \ s$-character) is more electronegative than $sp^2$ hybridization ($33.3\% \ s$-character),$V$ is less stable than $II$.Thus,the decreasing order of stability is $I > III > IV > II > V$.

List-$I$ (Carbocation)	List-$II$ (Type)
$A$. $CH_3-C^{+}(CH_3)-CH_3$	$I$. Secondary carbocation
$B$. $CH_3-C^{+}H-CH_3$	$II$. Methyl carbocation
$C$. $CH_3-CH_2^+$	$III$. Primary carbocation
$D$. $CH_3^+$	$IV$. Tertiary carbocation

Consider the following carbocations:
$I. C_6H_5CH_2^+$
$II. CH_2=CH^+$
$III. CH_3-CH^+(CH_3)$
$IV. CH_3-CH_2^+$
$V. HC \equiv C^+$
Arrange the above carbocations in the order of decreasing stability.

Similar Questions

Match the following columns and select the correct option.

List-$I$ (Carbocation) List-$II$ (Type)

$A$. $CH_3-C^{+}(CH_3)-CH_3$ $I$. Secondary carbocation

$B$. $CH_3-C^{+}H-CH_3$ $II$. Methyl carbocation

$C$. $CH_3-CH_2^+$ $III$. Primary carbocation

$D$. $CH_3^+$ $IV$. Tertiary carbocation

Identify the correct order of stability for carbocations.

Which amongst the following is the most stable carbocation?

The stability of carbanions follows the order:
$I: CH_3CH_2CH_2\bar{C}H_2$
$II: CH_3\bar{C}HCH_2CH_3$
$III: (CH_3)_3\bar{C}$
$IV: CH_3\bar{C}(Ph)CH_2CH_3$

The correct order of stability of the given carbocations is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Consider the following carbocations:$I. C_6H_5CH_2^+$$II. CH_2=CH^+$$III. CH_3-CH^+(CH_3)$$IV. CH_3-CH_2^+$$V. HC \equiv C^+$Arrange the above carbocations in the order of decreasing stability.