The correct order of rates of C-Br bond ionis | vedclass

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

Question

(D) The rate of $C-Br$ bond ionisation depends on the stability of the resulting carbocation. Greater stability of the carbocation leads to a faster r

Vedclass · Accepted Answer

$ii > i > iii$

Vedclass · Answer

(D) The rate of $C-Br$ bond ionisation depends on the stability of the resulting carbocation. Greater stability of the carbocation leads to a faster rate of ionisation.In species $(ii)$,the loss of $Br^-$ generates a pyrylium cation,which is aromatic ($6\pi$ electrons) and highly stable.In species $(i)$,the loss of $Br^-$ generates an allylic carbocation,which is stabilized by resonance but is less stable than the aromatic pyrylium cation.In species $(iii)$,the loss of $Br^-$ generates a secondary alkyl carbocation,which is the least stable among the three as it is only stabilized by hyperconjugation.Therefore,the correct order of stability of carbocations and thus the rate of ionisation is $ii > i > iii$.

The correct order of rates of $C-Br$ bond ionisation of the following bromides is

Similar Questions

What is the product formed by the addition of $HCl$ to $1$-phenylpropene?

The rate of dehydrohalogenation of which one among the following is the least?

The highest peak in the energy profile diagram for the mechanism of alkaline hydrolysis of tertiary butyl bromide represents:

Which information below regarding this reaction is applicable?
$CH_3-O-CH_2-Cl \xrightarrow{aq. OH^-, \Delta} CH_3-O-CH_2-OH$

The reaction of $n$-propyl bromide with ethanolic potassium hydroxide $(KOH)$ produces ...... .

Vedclass Test Series

Exam Paper Generator

Online Exam Module