Zadanie 2e
Wzorowane na: Chemistry HL Paper 2, May 2024, TZ1, pytanie 2(e). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Pentan-2-ol is optically active.
(i) Sketch the two enantiomers of pentan-2-ol, showing how they are related.
(ii) Deduce the organic product formed in each case when pentan-1-ol and pentan-2-ol are refluxed with acidified potassium dichromate(VI).
Pentan-1-ol:
Pentan-2-ol:
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(i) correct three-dimensional representation of pentan-2-ol: the stereocentre (carbon 2) carries H, OH, CH3 and CH2CH2CH3, shown with wedges and dashes ✔
the second molecule is the non-superimposable mirror image of the first / the two are drawn as mirror images ✔
(ii) pentan-1-ol: pentanoic acid ✔
pentan-2-ol: pentan-2-one ✔
Schemat punktowania
(i) M1: a correct tetrahedral representation with all four groups; M2: the two molecules clearly related as mirror images (a mirror line may be drawn). (ii) [1] each; accept correct structural formulas, CH3CH2CH2CH2COOH and CH3COCH2CH2CH3. Do not accept pentanal for pentan-1-ol under reflux.