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

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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

The product obtained from the reaction is:

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The following reaction is supposed to take place through the $S_N1$ mechanism: $CH_3-C(Ph)(OH)-CH_2-CH_3 \xrightarrow{HI} \text{products}$. If the configuration of the substrate is $D$,then the configuration of the products will be:

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