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(D) The reactivity of compounds towards $S_N1$ substitution depends on the stability of the carbocation formed in the rate-determining step. $1. CH_3C

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$3 < 1 < 4 < 2$

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(D) The reactivity of compounds towards $S_N1$ substitution depends on the stability of the carbocation formed in the rate-determining step. $1. CH_3CH_2Br ightarrow CH_3CH_2^+$ (Ethyl carbocation,$1^\circ$) $2. CH_2=CHCH(Br)CH_3 ightarrow CH_2=CHCH^+CH_3$ (Allylic carbocation,resonance stabilized) $3. CH_2=CHBr ightarrow CH_2=CH^+$ (Vinyl carbocation,highly unstable) $4. CH_3CH(Br)CH_3 ightarrow CH_3CH^+CH_3$ (Isopropyl carbocation,$2^\circ$) The stability order of carbocations is: $	ext{Vinyl} Therefore,the reactivity order is $3 < 1 < 4 < 2$.

The correct order for increasing reactivity towards $S_N1$ substitution for the following compounds is:
$1. CH_3CH_2Br$
$2. CH_2=CHCH(Br)CH_3$
$3. CH_2=CHBr$
$4. CH_3CH(Br)CH_3$

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The correct order for increasing reactivity towards $S_N1$ substitution for the following compounds is: $1. CH_3CH_2Br$ $2. CH_2=CHCH(Br)CH_3$ $3. CH_2=CHBr$ $4. CH_3CH(Br)CH_3$