What happens when concentrated $H_2SO_4$ reacts with sugar?

Which of the following reactions can produce hydrogen gas?

The highest industrial consumption of molecular hydrogen is to produce compounds of element ...... .

At $298.2 \ K$,the relationship between the enthalpy of bond dissociation (in $kJ \ mol^{-1}$) for hydrogen $(E_{H})$ and its isotope,deuterium $(E_{D})$,is best described by:

What are hydrides? Give their types and explain.

In the following reaction,assign the state for the underlined atom in the product of complete hydrolysis at $R.T.$:
$\underline{B}_2H_6 + H_2O \longrightarrow H_3BO_3 + H_2 \uparrow$