The compound that will undergo $\text{S}_\text{N}1$ reaction with the fastest rate is:

The question is incomplete as the chemical structures for the options are missing from the input data (likely due to missing images). However, the rate of an $\text{S}_\text{N}1$ reaction is determined by the stability of the intermediate carbocation formed in the slow, rate-determining step. The general order of reactivity of alkyl halides towards $\text{S}_\text{N}1$ reactions is tertiary ($3^{\circ}$) > secondary ($2^{\circ}$) > primary ($1^{\circ}$). Allylic and benzylic halides also show high reactivity because their corresponding carbocations are stabilized through resonance . Based on the provided probable answer, the compound in Option 4 forms the most highly stabilized carbocation.