Zadanie 4c
Wzorowane na: Chemistry HL Paper 2, May 2026, TZ3, pytanie 4(c). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 4a-4f.
Organic compounds are made from many different starting materials and by a variety of reactions, and some of them are used as fuels.
Polecenie
(i) State the names of the organic compounds used to produce the ester shown below.
(ii) State the name of the by-product of this reaction.
(iii) The compounds butan-1-ol and ethoxyethane have the same molar mass. Their structures are shown below.
Explain, with reasons, why butan-1-ol has a higher boiling point than ethoxyethane.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz CKE i punktacja
Odpowiedź z klucza
(i) ethanoic acid ✔
propan-1-ol ✔
(ii) water ✔
(iii) butan-1-ol forms hydrogen bonds between its molecules AND ethoxyethane has only dipole–dipole «and London» forces between molecules ✔
hydrogen bonds are stronger «than the intermolecular forces in ethoxyethane», so more energy is needed to separate the molecules ✔
Schemat punktowania
(i) [1] each; accept ethanoyl chloride or ethanoic anhydride for the acid; [1 max] for the formulas CH3COOH and CH3CH2CH2OH. (ii) [1]: the by-product must match part (i): hydrogen chloride if the acid chloride was named, ethanoic acid if the anhydride was named; do not accept a structural formula. (iii) [1] each.