Zadanie 5g
Wzorowane na: Chemistry HL Paper 2, November 2024, pytanie 5(g). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 5d-5g.
3-Methylbutanoic acid, (CH3)2CHCH2COOH, is responsible for the smell of some mature cheeses. Its molar mass is 102.15 g mol−1.
Polecenie
3-Methylbutanoic acid reacts with propan-1-ol, CH3CH2CH2OH, to form an organic product and water. Deduce the structural formula and the empirical formula of the organic product.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Structural formula: (CH3)2CHCH2COOCH2CH2CH3
ester functional group / −C(=O)O− linkage ✔
rest of the structure: 3-methylbutanoyl group on the carbonyl carbon AND propyl group on the oxygen ✔
«accept condensed, full structural or skeletal formula»
Empirical formula: C4H8O ✔
«C8H16O2 is the molecular formula of the product, divided by 2»
Schemat punktowania
M1: ester functional group; M2: rest of the structure correct for the acid and the alcohol used; M3: empirical formula. Accept unambiguous abbreviated structural formulas, such as (CH3)2CHCH2COOC3H7 if the propyl group is unbranched. ECF for M3 from an incorrect structure in M1/M2, provided the structure is that of an ester.