thx
2 Answers
Asish Mahapatra
·2009-10-02 21:45:20
(a) is an alkyne which is less reactive towards electrophilic subs than alkenes.
(b) in this there is no conjugation in the carbocation formed
(c) and (d) form allylic carbocations
in (d) all the resonance structures are 2° allylic so my guess is (d)