DP Chemistry (last assessment 2024)

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Question 20N.3.sl.TZ0.7b(i)

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.3.sl.TZ0.7b(i)
Level sl Paper 3 Time zone TZ0
Command term Deduce Question number b(i) Adapted from N/A
b(i).
[Maximum mark: 1]
20N.3.sl.TZ0.7b(i)
(b(i))

The diverse functions of biological molecules depend on their structure and shape.

Deduce the straight chain structure of deoxyribose from its ring structure drawn in section 34 of the data booklet.

[1]

Markscheme

–CH2– must be placed next to CHO AND 2OHs on central carbons must be on same side (LHS or RHS) ✔

Accept crosses in place of C on three middle carbons.

Examiners report

Very disappointing. I had only a few correct answers and the wrong ones very often showed no understanding at all. Some candidates drew ring structures even though a straight chain was requested.

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