CH3-(CH2)4-CH3(P)→anhy.AlCl3HClX+Y.   X and Y are the major products. False statement about P, X, Y is

The only structural isomerism exhibited by alkanes is chain isomerism. P= n-hexane ; X = 2  - Methyl pentane ; Y = 3 - Methyl pentane;P, X, Y are all alkanes;