The highest industrial consumption of molecular hydrogen is to produce compound of element :

The question asks about the highest industrial consumption of molecular hydrogen ($$H_2$$).

Key Industrial Uses of Hydrogen:

1. Haber-Bosch Process (Ammonia synthesis): $$N_2 + 3H_2 \rightarrow 2NH_3$$ — This is by far the largest industrial consumer of hydrogen gas worldwide. Approximately 50-60% of all industrially produced hydrogen is used to manufacture ammonia.

2. Hydrogenation of oils and fats (carbon compounds) — uses hydrogen but in much smaller quantities.

3. Production of methanol ($$CO + 2H_2 \rightarrow CH_3OH$$) — significant but smaller than ammonia production.

4. Production of HCl (hydrogen + chlorine) — relatively small scale.

Since ammonia ($$NH_3$$) is a compound of nitrogen, the element whose compound consumes the most molecular hydrogen industrially is Nitrogen.

The correct answer is Option D: Nitrogen.