DP Chemistry (last assessment 2024)

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Question 19M.1.hl.TZ2.35

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.hl.TZ2.35
Level hl Paper 1 Time zone TZ2
Command term Question number 35 Adapted from N/A
35.
[Maximum mark: 1]
19M.1.hl.TZ2.35

What must be present on a nucleophile?

A. Negative charge

B. Lone pair of electrons

C. Positive charge

D. Symmetrical distribution of electrons

[1]

Markscheme

B

Examiners report

72 % of the candidates chose B (a nucleophile must have a lone pair of electrons). The most commonly chosen distractor was A (a nucleophile must have a negative charge). Some teachers commented that both answers A and B are correct. However, the word “must” in the question means B is the only answer. Candidates are aware that some nucleophiles like water are neutral. Moreover, the definition of a nucleophile is clearly stated in the syllabus (topic 10.2).

Syllabus sections