Zadanie 1e
Wzorowane na: Chemistry SL Paper 2, May 2024, TZ2, pytanie 1(e). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 1a-1c, 1e.
Compound A is a colourless organic liquid. It was burnt completely in excess oxygen, which gives only carbon dioxide and water, and the mass percentages of carbon and hydrogen in A were found to be as follows.
| C / % | H / % |
|---|---|
| 69.70 | 11.72 |
Polecenie
When A is refluxed with excess acidified potassium dichromate(VI), K2Cr2O7, the product is compound E, whose molar mass is greater than that of A.
From this information alone, identify one functional group in E.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
carboxyl ✔
OR
−COOH / −CO2H ✔
Schemat punktowania
[1] for carboxyl. Accept carboxylic acid.
Komentarz
A product heavier than A cannot be an aldehyde or a ketone formed from an alcohol, because those are lighter; the added oxygen points to a carboxylic acid.