Order each of the following sets of compounds with respect to SN 1 reactivity: (a) (b) (CH3)3 CC

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Order each of the following sets of compounds with respect...

Order each of the following sets of compounds with respect to $\mathrm{S}_{\mathrm{N}} 1$ reactivity:
(a)
(b) $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCl}$
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CBr}$
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}$
(c)

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Key Concepts

SN1 Reaction Mechanism

The SN1 mechanism is characterized by a two-step process where the first and rate?determining step is the formation of a carbocation intermediate. This initial ionization step is unimolecular, meaning that the reaction rate depends only on the concentration of the substrate and not on the nucleophile.

Carbocation Stability

Carbocation stability is a major factor in SN1 reactions because the reaction rate is governed by the ease with which the carbocation forms. More substituted carbocations, such as tertiary ones, are more stable due to hyperconjugation and inductive effects, allowing them to form more readily compared to secondary or primary carbocations.

Leaving Group Ability

The ability of a group to leave is crucial in the SN1 mechanism since it determines the rate at which the carbocation can form. Better leaving groups, which are more stable as independent species once they depart, lead to faster ionization and hence increase the reactivity in an SN1 reaction.

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