Zadanie 24b
Wzorowane na: Chemistry HL Paper 3, May 2024, TZ1, pytanie 24(b). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
4-Phenylbutan-2-one is made by oxidizing 4-phenylbutan-2-ol. A sample of the product is contaminated with some unreacted alcohol. The infrared spectra of the pure ketone and of the pure alcohol are shown.
Deduce, giving two reasons, which spectrum belongs to the alcohol. Use section 20 of the data booklet.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
A ✔
broad absorption at 3200-3600 cm−1 due to O-H «in an alcohol» ✔
no absorption at 1700-1750 cm−1 for C=O ✔
Schemat punktowania
A is needed for the marks to be awarded; award M1 for the broad O-H absorption and M2 for the absence of the C=O absorption. Accept any wavenumber within the ranges quoted. Apply ECF if B is chosen with consistent reasons (award [1 max]).