Which of the following is a correct feature o | vedclass

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(B) $1$. The $SN^2$ mechanism is a concerted, single-step reaction.$2$. It involves a backside attack by the nucleophile, leading to an inversion of c

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The $SN^2$ mechanism includes a transition state with penta-coordinated carbon.

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(B) $1$. The $SN^2$ mechanism is a concerted, single-step reaction.$2$. It involves a backside attack by the nucleophile, leading to an inversion of configuration (Walden inversion), not racemization.$3$. During the reaction, the nucleophile and the leaving group are both partially bonded to the central carbon atom in a transition state, where the carbon atom is penta-coordinated (bonded to five groups).$4$. $SN^2$ reactions do not involve the formation of carbocation intermediates.$5$. Therefore, the correct feature is that it includes a transition state with a penta-coordinated carbon.

Which of the following is a correct feature of the $SN^2$ mechanism?

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