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

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(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

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$ii > i > iii$

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(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

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