A-LevelChemistryHalogen derivatives9701/12 · May/June 2025 · Q281 Mark

Which row gives pentanenitrile as one product?

A[halogenoalkane: [skeletal formula of CH3CH2CH2CH2Br], reagents and conditions: heat with HCN]

B[halogenoalkane: [skeletal formula of CH3CH2CH2CH2Br], reagents and conditions: heat with KCN using ethanol as solvent]

C[halogenoalkane: [skeletal formula of CH3CH2CH(Br)CH3], reagents and conditions: heat with HCN]

D[halogenoalkane: [skeletal formula of CH3CH2CH(Br)CH3], reagents and conditions: heat with KCN using ethanol as solvent]

✓ Correct answer

B: [halogenoalkane: [skeletal formula of CH3CH2CH2CH2Br], reagents and conditions: heat with KCN using ethanol as solvent]

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Topic: Halogen derivatives, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2025 Paper 1 Variant 2, question 28.

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