Zadanie 3d
Wzorowane na: Chemistry HL Paper 3, November 2023, TZ2, pytanie 3(d). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Nomex is a synthetic fibre used in fire-resistant clothing. It is a polyamide formed from the two monomers shown.
Draw one repeating unit of Nomex.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
−NH − C6H4 − NH − CO − C6H4 − CO − with an amide/peptide linkage between the monomer units, both rings 1,3-disubstituted, and continuation bonds at both ends ✔
Schemat punktowania
The mark needs continuation bonds at both ends; brackets and a subscript n are ignored. Both rings must carry their two substituents in positions 1 and 3.
Komentarz
The amide group is formed by condensation and can be broken again by hydrolysis, so acid attacks the chain itself as well as the hydrogen bonds between chains.