As the coefficient of cubical expansion is more for alcohol then metal.

When we increase temperature, expansion in alcohol is more and hence density decreases,

The buoyant force $\mathrm{F}={\mathrm{V\rho }}_{\mathrm{w}}\mathrm{g}$ decreases as an increase in metal volume are less but the decrease in the density of water is more.

Hence ${\mathrm{w}}_1<{\mathrm{w}}_2$