Question 1
Paper 2Medium6 marksBoron trifluoride forms a 1:1 adduct with ammonia:
Reaction I: BF₃ + NH₃ → BF₃·NH₃
A proton reacts with water to form a hydronium ion:
Reaction II: H⁺ + H₂O → H₃O⁺
(a)[2]
Identify the electrophile in reaction I and state which reactant supplies both electrons in the new B–N bond.
(b)[2]
Identify the electrophile in reaction II and explain the origin of both electrons in the new O–H bond.
(c)[2]
A student claims that an electrophile must be positively charged. Assess this claim using both reactions.