Least reactive alkyl bromide towards SN1 reaction is

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n-butyl bromide

Iso butyl bromide

Tert-butyl bromide

Sec-butyl bromide

answer is A.

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Detailed Solution

Rate of reactivity towards SN1 reaction ∝ stability of carbocation. Stability of CH33C+>CH3C+HCH2CH3>(CH3)2CHC+H2>CH3CH2CH2C+H2

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