Wzorowane na: Chemistry HL Paper 2, May 2025, TZ2, pytanie 1(d). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Informacja do zadań 1a-1d.
Hydrogen cyanide,
Cyanide ions react with bromoethane, .
(i) Draw the full structural formula of the organic product of this reaction.
(ii) Predict which mechanism, or , operates in this reaction, and give a reason for your choice.
(iii) Explain what experiment could be carried out, and how its result would be interpreted, to decide between the and mechanisms for this reaction.
(i) «propanenitrile, drawn with every bond shown» ✔
(ii) AND bromoethane is a primary halogenoalkane «a primary carbocation would be too unstable» ✔
(iii) measure the initial rate for several concentrations of cyanide ions, keeping
if the rate is proportional to the mechanism is «rate
(i) [1] the nitrile with the correct three-carbon chain; the C-N triple bond must be shown. (ii) [1] SN2 together with the reason (primary substrate or unstable primary carbocation). (iii) [2] M1 experiment: vary the nucleophile concentration with everything else unchanged; M2 how the result is interpreted for each mechanism.
A common error in (iii) is to vary the halogenoalkane concentration only; both mechanisms are first order in the halogenoalkane, so that experiment cannot distinguish them.
Porównujesz swoje rozwiązanie z kluczem? Maturownik+ oceni je analizą AI, policzy punkty wg schematu i zapisze Twoje błędy w kompendium.
Policz na kartce jak na maturze, odsłoń klucz i porównaj. Potem odhacz, żeby wiedzieć, co masz już za sobą.
ZrobioneOdhaczanie zapisuje się na Twoim koncie, więc wymaga darmowego konta. Zajmuje chwilę i wracasz do tego samego zadania.