adding as an info:
Ph3C+ has been stored in bottles before.
Which of the following carbocation can be easily isolated ?
(A) (Me)3C+
(B)
+
(C) Ph-CH2
+
(D) H2C=CH--CH2
Ans: B
Tropylium Carbocation is highly stable..1011 times stable than Ph3C+ so it can be easily isolated..