A-LevelChemistryHalogen derivatives9701/12 · Oct/Nov 2018 · Q381 Mark

Halogenoalkanes can undergo reaction with hydroxide ions. RBr + OH⁻ → ROH + Br⁻ The reaction of some halogenoalkanes proceeds by the SN1 mechanism. Which statements about the SN1 mechanism are correct? 1 A carbocation is formed which is stabilised by the inductive effect of the alkyl groups present. 2 Only tertiary halogenoalkanes are hydrolysed in this way. 3 The intermediate formed includes a carbon atom with five bonds attached to it.

A1, 2 and 3 are correct

B1 and 2 only are correct

C2 and 3 only are correct

D1 only is correct

✓ Correct answer

D: 1 only is correct

Oracle Prep sorts past-paper questions by topic, so you can drill Halogen derivatives and see which topics are most likely to come up next.

Topic: Halogen derivatives, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 2, question 38.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content