Classify the following carbocations by increasing stability:
(A carbocation is especially stable as its positive charge is "attenuated", for example by a substitant with donor +I effect).
6 $\lt$ 5 $\lt$ 3 $\lt$ 2 $\lt$ 1 $\lt$ 4
The $+ I$ effect of two methyl groups are generally more effective than the $+ I$ effect of one ethyl.
