Zadanie 3f
Wzorowane na: Chemistry SL Paper 2, May 2022, TZ1, pytanie 3(f). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 3a-3f.
Zinc is a reactive metal found in alloys such as brass. Magnesium is another reactive metal, and its organometallic compounds are widely used in organic synthesis.
Polecenie
Bromoethane can be converted into ethanol:
CH3CH2Br + HO− → CH3CH2OH + Br−
(i) Identify the type of reaction.
(ii) Outline what must be true of a collision between reacting particles for a reaction to occur.
(iii) Carbon-halogen bonds are polar, which facilitates attack by HO−. State, giving a reason, whether the C−Cl bond or the C−I bond is more polar. Use section 9 of the data booklet.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(i) «nucleophilic» substitution ✔
OR
SN2 ✔
(ii) energy of the collision ≥ activation energy / Ea ✔
correct orientation «of the reacting particles» ✔
(iii) C−Cl AND chlorine is more electronegative «3.2» than iodine «2.7» / the electronegativity difference with carbon «2.6» is larger for Cl «0.6» than for I «0.1» ✔
Schemat punktowania
(i) [1]; accept hydrolysis, SN2 or bimolecular nucleophilic substitution. (ii) [1] each. (iii) [1] for the bond with a reason based on electronegativity values.