Question

multiple choice 1 point
which of the following statements best describes an ( s_{n} 2 ) reaction?
it typically occurs with tertiary alkyl halides.
it is a two - step mechanism.
the rate depends on both the nucleophile and the substrate concentrations.
it involves a carbocation intermediate.

Explanation:

• For an \(S_N2\) reaction, the rate law is \(rate = k[Nu^-][R - L]\), where \([Nu^-]\) is the nucleophile concentration and \([R - L]\) is the substrate concentration. So the rate depends on both.
• \(S_N2\) reactions do not typically occur with tertiary alkyl halides because of steric hindrance.
• \(S_N2\) is a one - step mechanism (concerted), while \(S_N1\) is a two - step mechanism with a carbocation intermediate.

Answer:

The rate depends on both the nucleophile and the substrate concentrations.