Assertion (A): Increase in temperature increases vapour pressure of a liquid.

Reason (R): Volume of a solution increases by increasing the temperature.

Increase in temperature increases vapour pressure of a liquid this is a correct statement. Volume of solution increases by in creating temperature.  As per Charles’s Law  $\text{V}\propto \text{T or }\frac{\text{V}}{\text{T}}=\text{K}$  (constant) . So, this is also correct statement.  But there is no relation between A & R.