Q. Arrange the following cations in the increasing order of their stability. Justify$C{H}_3\stackrel{+}{C}{H}_2, {\left(C{H}_3\right)}_3\stackrel{+}{C}, {\left(C{H}_3\right)}_2\stackrel{+}{C}H, \stackrel{+}{C}{H}_3$

The solution is as follows:

1. The cations arranged according to their increasing order in stability are as follows:


         ⁺CH₃ < CH₃CH_​2⁺ < (CH₃)₂CH⁺ < (CH₃)₃C⁺

2. This is because tertiatry carbocation is most stable due to hyperconjugation. The alpha hydrogens available are in the order:

            0 < 3 < 6 < 9

Thus, higher number of alpha hydrogens, higher is the stability.