Hyperconjugation is most useful for stabilising which of the following carbocations?

Step-by-step solution

On the basis of hyperconjugation, stability order of different alkyl carbocations is 3^ 2^ 1^ methyl In t -butyl cation, the C -atom bearing the positive charge is attached to three methyl groups, thus it will have maximum hyperconjugate structures, which give it maximum stability.