The conversion of acetylene into ethanol can be achieved through a series of chemical reactions. Here is a step-by-step process for this conversion:

1. Hydroboration:

- React acetylene with diborane (B2H6) in the presence of a transition metal catalyst, such as rhodium or cobalt, to form vinylborane (CH2=CH-BH2).

2. Oxidation:

- Oxidize the vinylborane with hydrogen peroxide (H2O2) in the presence of a base, such as sodium hydroxide (NaOH), to form acetaldehyde (CH3CHO). This reaction is known as the hydroboration-oxidation reaction.

3. Hydrosulfite Addition:

- React acetaldehyde with sodium hydrogen sulfite (NaHSO3) to form the addition product, sodium hydrogen sulfite adduct (CH3CHOH-SO3Na).

4. Hydrolysis:

- Heat the sodium hydrogen sulfite adduct with water (H2O) to hydrolyze it and release ethanol (CH3CH2OH) as the final product.

The overall reaction scheme for the conversion of acetylene to ethanol can be represented as follows:

C2H2 (acetylene) + B2H6 (diborane) → CH2=CH-BH2 (vinylborane)

CH2=CH-BH2 (vinylborane) + 3H2O2 (hydrogen peroxide) → CH3CHO (acetaldehyde) + B(OH)3 (boric acid)

CH3CHO (acetaldehyde) + NaHSO3 (sodium hydrogen sulfite) → CH3CHOH-SO3Na (sodium hydrogen sulfite adduct)

CH3CHOH-SO3Na (sodium hydrogen sulfite adduct) + H2O (water) → CH3CH2OH (ethanol) + NaHSO3 (sodium hydrogen sulfite)

This multi-step process allows for the efficient conversion of acetylene, a starting material derived from hydrocarbons or natural gas, into ethanol, an important biofuel and industrial solvent.