The compound (X) on (i) on heating in the presence of anhydrous AlCl₃ and HCl gas gives 2,4 -dimethyl pentane (ii) aromatization gives toluene and (iii) cyclisation gives methyl cyclohexane The correct name of compound (X) is:

Step-by-step solution

Compound (X) undergoes isomerization on heating with anhydrous AlCl₃ and HCl gas to give branched-chain alkanes. The formation of 2,4 -dimethylpentane (a 7 -carbon branched alkane) indicates that (X) is a 7 -carbon straight-chain alkane. Aromatization of n-heptane at high temperature and pressure in the presence of oxides of V, Mo, or Cr supported over alumina gives toluene. Cyclisation of n-heptane under similar conditions initially yields methylcyclohexane, which can further undergo dehydrogenation to form toluen