Give the evidence for the reaction between sucrose and concentrated sulphuric acid is a dehydration reaction.

Present given reaction has two half-equations.

${\mathrm{Cu}}^{2+}\left(\mathrm{aq}\right)+\mathrm{Zn}\left(\mathrm{s}\right)\to \mathrm{Cu}\left(\mathrm{s}\right)+{\mathrm{Zn}}^{2+}\left(\mathrm{aq}\right)$

Evaluate the feasibility of the Daniel cell for contributing to global energy requirements.