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

Practise Edexcel IAL Chemistry 11.9 by linking rate-law dependence to carbocation or concerted mechanisms and distinguishing primary from tertiary halogenoalkanes.

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.
distinguish primary and tertiary halogenoalkanes using structure, steric hindrance and mechanism

[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