Which of the following statements is not correct?

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In $S_{N} 1$ mechanism, the rate determining step involves only one molecule.

In $S_{N} 1$ mechanism, intramolecular arrangement is possible.

In chiral molecule, the $S_{N} 1$ mechanism produces racemic mixture.

The intermediate formed in $S_{N} 1$ mechanisms involves five atoms attached to carbon centre of substitution reaction.

answer is D.

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Detailed Solution

(1) ${SN}^{1}$ reaction: Take into account tert-butyl bromide's alkaline hydrolysis to produce tert-butanol.
${CH}_{3} C {({CH}_{3})}_{2} - Br + NaOH \overset{Δ}{⟶} {CH}_{3} C {({CH}_{3})}_{2} - OH + NaBr$
Only the concentration of tert-butyl bromide affects the pace of the reaction; the hydroxide ion concentration has no effect.
Rate is equal to $= K [{CH}_{3} C {({CH}_{3})}_{2} - Br]$
The reaction happens in this order: 1. Breaking of the carbon-Br bond is followed by the creation of the carbon-hydroxide ion bond in the rate-determining step. As only tert-butyl bromide is involved in the step that determines reaction rate, the reaction is hence unimolecular.