Edexcel A-Level Chemistry AS 10.4 The Definition of the Term Nucleophile Questions

Look for an available lone pair rather than a negative charge alone, then identify the δ+ or positively charged atom that can accept that pair.

Exam points

Select a nucleophile by finding an available lone pair that can attack an electron-deficient atom.
Reject species such as NH₄⁺ that lack an available lone pair despite containing nitrogen.

[Maximum number: 1]

Which of these species is not a nucleophile?

$\mathrm{NH}_{4}^{+}$

$\mathrm{CN}^{-}$

$\mathrm{H}_{2} \mathrm{O}$

$\mathrm{CH}_{3} \mathrm{NH}_{2}$

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