Zadanie 6b
Wzorowane na: Chemistry HL Paper 2, November 2023, TZ2, pytanie 6(b). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Benzene is converted into nitrobenzene by heating it with a mixture of concentrated nitric and sulfuric acids. The attacking species is the electrophile NO2+.
Explain the mechanism by which benzene is nitrated by NO2+, showing the movement of electron pairs with curly arrows.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
curly arrow from the delocalized electrons of the benzene ring to the nitrogen atom of NO2+ ✔
representation of the carbocation intermediate with the correct formula, the hydrogen and nitro group on the same carbon and a positive charge on the ring ✔
curly arrow from the C–H bond to the ring, restoring the delocalized ring ✔
formation of nitrobenzene AND H+ «accepted by HSO4−» ✔
Schemat punktowania
Accept a curly arrow that goes to either the nitrogen atom or the charge on NO2+ for M1. For M2 accept different ways of showing the delocalization in the intermediate, and Kekulé structures. Do not penalize the use of +NO2.