Zadanie 3f
Wzorowane na: Chemistry SL Paper 2, November 2023, TZ2, pytanie 3(f). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 3a-3f.
Propanoic acid can be converted into an ester, CH3CH2COOCH3, by heating it with a second reagent in the presence of an acid catalyst.
Polecenie
State the name of a compound that would form the carboxylic acid you drew in part 3e when it is heated under reflux with an excess of an oxidizing agent.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
a primary alcohol or an aldehyde that has the same carbon skeleton as the acid in 3e ✔
for butanoic acid: butan-1-ol OR butanal
for 2-methylpropanoic acid: 2-methylpropan-1-ol OR 2-methylpropanal
Schemat punktowania
Award [1] for the name of a primary alcohol or aldehyde that matches the acid drawn in 3e (ECF from 3e). Do not accept a formula in place of a name, and do not accept a secondary alcohol, a ketone or a tertiary alcohol.
Komentarz
Refluxing with excess oxidant takes a primary alcohol through the aldehyde to the carboxylic acid, so both types of precursor are accepted.