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Edexcel IAL Chemistry 10.5 Bond polarity and mechanism choice

Add the correct δ+ and δ− labels from electronegativity, then start the nucleophile's curly arrow toward the δ+ atom and justify why an unpolarised bond resists attack.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Add the relevant dipole to C–O or C=O before selecting a nucleophilic mechanism.
  • Explain hydride attack on polar C=O through attraction to δ+ carbon, unlike non-polar C=C.
  • Link the polar C–halogen or C–O bond to nucleophilic substitution at carbon.

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