Upon addition of 1mol of NaCl to 1L of water, the boiling point of water increases, because, as we also know that addition of non-volatile solute to solvent decreases the vapour pressure of solvent, due to which the boiling point of solvent increases. As we know that NaCl is non-volatile solute, hence it's addition to water decreases water's vapour pressure as a result of which, the boiling point of water increases.

While on the other hand, we have Methyl Alcohol which is more volatile than water, hence upon it's addition to water, the total vapour pressure over the solution increases, and the boiling point of water decreases.