Zadanie 26
Wzorowane na: Chemistry SL Paper 1, November 2022, pytanie 26. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Which conditions best favour the oxidation of butan-1-ol to butanal rather than to butanoic acid?
A. Excess oxidizing agent, heated under reflux
B. Excess oxidizing agent, heated with the product distilled off as it forms
C. Limited oxidizing agent, heated under reflux
D. Limited oxidizing agent, heated with the product distilled off as it forms
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
D ✔
«the aldehyde is the intermediate of a two-step oxidation; it is kept from oxidizing further by using a limited amount of oxidizing agent and by distilling it off as it forms. Excess oxidant and reflux would return the aldehyde to the reaction mixture and oxidize it to the acid»
Schemat punktowania
One mark for the correct option.