Zadanie 3a
Wzorowane na: Chemistry HL Paper 2, May 2023, TZ1, pytanie 3(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Halogenoalkanes form a homologous series.
(i) Outline the meaning of homologous series.
(ii) State the preferred IUPAC name of each of the two compounds shown.
(iii) State which of the two compounds contains a chiral carbon atom and identify that carbon atom by its position in the carbon chain.
(iv) But-1-ene can be polymerized. Draw a section of the resulting polymer showing two repeating units.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(i) compounds of the same family «same functional group» AND with the same general formula
OR
compounds of the same family AND differing by a common structural unit / CH2 ✔
(ii) X: 3-bromo-2-methylpentane ✔
Y: 1-bromo-3-methylbutane ✔
(iii) compound X, carbon 3 «the carbon bonded to Br, H, an ethyl group and a propan-2-yl group» ✔
(iv) a backbone of four carbon atoms with an ethyl side group on carbons 2 and 4, for example −CH2−CH(CH2CH3)−CH2−CH(CH2CH3)−, with continuation bonds at both ends ✔
Schemat punktowania
(i) [1]. (ii) [2]: one mark per correct name; the locants and the alphabetical order (bromo before methyl) must be correct. (iii) [1]: both the compound and the carbon are needed. (iv) [1]: continuation lines must be shown; ignore square brackets and 'n'; the two repeating units must be identical and joined head to tail.