A-LevelChemistryAnalytical techniques9701/12 · Oct/Nov 2011 · Q371 Mark
Compound X has molecular formula C4H10O. Separate samples of X are tested with three different reagents. Which results could not be obtained?
ATollens' reagent: silver mirror forms, 2,4-dinitrophenylhydrazine reagent: orange precipitate forms, warm acidified potassium dichromate(VI) solution: colour changes from orange to green
BTollens' reagent: no change, 2,4-dinitrophenylhydrazine reagent: no change, warm acidified potassium dichromate(VI) solution: no change
CTollens' reagent: no change, 2,4-dinitrophenylhydrazine reagent: no change, warm acidified potassium dichromate(VI) solution: colour changes from orange to green
DTollens' reagent: silver mirror forms, 2,4-dinitrophenylhydrazine reagent: no change, warm acidified potassium dichromate(VI) solution: colour changes from orange to green
✓ Correct answer
D: Tollens' reagent: silver mirror forms, 2,4-dinitrophenylhydrazine reagent: no change, warm acidified potassium dichromate(VI) solution: colour changes from orange to green
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