Name:

The acid that produces sugar charcoal from sugar.

Conc. sulphuric acid $\mathbf{\left(}{\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{4}}\mathbf{\right)}$ can produce sugar charcoal from the sugar.

$\underset{\left(\mathrm{Sugar}\right)}{\underbrace{{\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}}\left(aq\right)}\stackrel{}{\stackrel{\mathrm{Conc}.{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }\underset{(\mathrm{Sugar}\mathrm{charcoal})}{\underbrace{12\mathrm{C}\left(\mathrm{s}\right)}}}+11{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

The product is dehydrated sugar charcoal from the sugar.

Hence, the acid which produces sugar charcoal from sugar is Conc. sulphuric acid $\mathbf{\left(}{\mathbf{H}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{4}}\mathbf{\right)}$.