Edexcel A-Level Chemistry A2 11.9 Knowledge of the Rate Equations for the Hydrolysis of Halogenoalkanes Can Be Used to Provide Evidence for Sn1 and Sn2 Questions

Determine which concentrations appear in the rate law, connect first-order RX dependence to carbocation formation and two-reactant dependence to concerted attack.

Exam points

Link rate = k[RX] to an SN1 slow ionisation step and carbocation intermediate.
Support SN2 when rate is first order in both halogenoalkane and nucleophile.
Interpret a two-peak SN1 profile with a carbocation intermediate between transition states.

[Maximum number: 1]

The equation shows the hydrolysis of a bromoalkane.

\mathrm{RBr}+\mathrm{OH}^{-} \rightarrow \mathrm{ROH}+\mathrm{Br}^{-}

The rate equation is rate $=k[\mathrm{RBr}]$
RBr is most likely to be

bromomethane

2-bromopropane

1-bromo-2-methylpropane

2-bromo-2-methylpropane

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Edexcel A-Level Chemistry A2 11.9 Knowledge of the Rate Equations for the Hydrolysis of Halogenoalkanes Can Be Used to Provide Evidence for Sn1 and Sn2 Questions question 1