DP Chemistry (last assessment 2024)
Question 20N.3.hl.TZ0.8b(i)
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.3.hl.TZ0.8b(i) |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Deduce | Question number | b(i) | Adapted from | N/A |
b(i).
[Maximum mark: 1]
20N.3.hl.TZ0.8b(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 AND 2OHs on central carbons must be on same side (LHS or RHS) ✔
Accept crosses in place of on three middle carbons.
Examiners report
The straight chain structure of deoxyribose was poorly represented. All sorts of errors were seen, such as not having –CHO at one end, not having the methylene group adjacent to –CHO etc.
