Zadanie 33
Wzorowane na: Chemistry HL Paper 1, May 2023, TZ1, pytanie 33. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Polecenie
Benzene reacts with bromine in the presence of iron(III) bromide to form bromobenzene, not an addition product. Which statement best explains this?
A. Benzene contains no carbon–carbon double bonds
B. The carbon–carbon bonds in benzene are weaker than those in alkenes
C. Substitution keeps the stable delocalized ring of electrons, which addition would destroy
D. Bromine cannot approach a planar molecule
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
C ✔
«the delocalized π system makes benzene unusually stable; substitution leaves the ring intact, whereas addition would remove the delocalization. The carbon–carbon bonds are all of equal length, intermediate between single and double, and are not weaker than in alkenes»
Schemat punktowania
One mark for the correct option.