Why hydrochloric acid does not ionise in methylbenzene?

Answer 1

Methyl benzene, or toluene, does not have a lone pair of electrons and so cannot act as a base and take the hydrogen ion away from the HCl molecule.

Answer 2

Hydrochloric acid does not ionize in methylbenzene because methylbenzene is a non-polar solvent, and ionic compounds like hydrochloric acid require a polar solvent to ionize. In non-polar solvents, the molecules of hydrochloric acid remain as molecules rather than dissociating into ions.