Which of the following represent the mechanistic steps that would occur when acetone is mixed with ethylene glycol and a strong acid (e.g., TsOH)?
(Nu attack-p.t.), p.t., p.t., "collapse", p.t.
p.t., Nu attack, p.t., p.t., "collapse", Nu attack, p.t.
p.t., Nu attack, p.t., p.t., (p.t-collapse")
p.t., Nu attack, p.t., p.t., "collapse" p.t.
p.t., Nu attack, p.t. p.t., "collapse", Nu attack, p.t., p.t., "collapse" p.t.
