Consider the following bromides.The correct o | vedclass

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(A) $S_N1$ reactions proceed via the formation of a carbocation intermediate. The rate of $S_N1$ reaction depends on the stability of the carbocation

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$B > C > A$

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(A) $S_N1$ reactions proceed via the formation of a carbocation intermediate. The rate of $S_N1$ reaction depends on the stability of the carbocation formed.$(A)$ forms a $1^o$ carbocation $(CH_3CH_2CH_2CH_2^+)$,which is the least stable.$(B)$ forms an allylic carbocation $(CH_2=CH-CH^+(CH_3))$,which is resonance-stabilized and therefore the most stable.$(C)$ forms a $2^o$ carbocation $(CH_3CH_2CH^+(CH_3))$,which is more stable than a $1^o$ carbocation but less stable than an allylic carbocation.Thus,the stability order of the carbocations is $B > C > A$. Consequently,the order of $S_N1$ reactivity is $B > C > A$.

	$S_{N}1$	$S_{N}2$
$(a)$	Retention of configuration	Inversion of configuration
$(b)$	Racemisation	Inversion of configuration
$(c)$	Inversion of configuration	Retention of configuration
$(d)$	Racemisation	Retention of configuration

Consider the following bromides.
The correct order of $S_N1$ reactivity is

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Consider the following bromides.The correct order of $S_N1$ reactivity is