Assertion :When methyl alcohol is added to water, boiling point of water increases.
Reason :When a volatile solute is added to a volatile solvent elevation in boiling point is observed.

Methyl alcohol and water both are volatile liquids which when mixed together to form a binary solution, the vapour pressure of this solution becomes more as compared to individual pure components. This affects the boiling point of water with a decrease.

When methyl alcohol is added to water A-B interaction < A-A or B-B interaction that is why it will show positive from Raoult's law. Since a positive deviation from Rault's law indicates a rise in vapour pressure the boiling point decreases.