Question 17N.2.sl.TZ0.a.ii
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.2.sl.TZ0.a.ii |
| Level | sl | Paper | 2 | Time zone | TZ0 |
| Command term | State | Question number | a.ii | Adapted from | N/A |
The structural formulas of two organic compounds are shown below.
State the observation expected for each reaction giving your reasons.
[2]
ALTERNATIVE 1 using K2Cr2O7:
Compound A: orange to green AND secondary hydroxyl
OR
Compound A: orange to green AND hydroxyl oxidized «by chromium(VI) ions»
Compound B: no change AND tertiary hydroxyl «not oxidized by chromium(VI) ions»
Award [1] for “A: orange to green AND B: no change”.
Award [1] for “A: secondary hydroxyl AND B: tertiary hydroxyl”.
ALTERNATIVE 2 using KMnO4:
Compound A: purple to colourless AND secondary hydroxyl
OR
Compound A: purple to colourless AND hydroxyl oxidized «by manganese(VII) ions»
Compound B: no change AND tertiary hydroxyl «not oxidized by manganese(VII) ions»
Accept “alcohol” for “hydroxyl”.
Award [1] for “A: purple to colourless AND B: no change”
Award [1] for “A: secondary hydroxyl AND B: tertiary hydroxyl”.
Accept “purple to brown” for A.