Reaction:
$C _2H _5Br+NaOH\rightarrow C _2H _5OH$

Reaction:
$CH _3CH _2Cl + KOH \rightarrow  C _2H _5OH + KCl + H _2O$

Commercial manufacturing occurs by fermentatiomn of molasses though natural fermentation in yeasts occurs by conversion of starch to ethanol.

Alcoholic beverages contain ethyl alcohol (ethanol). Alcohol by volume(ABV) is a standard measure of how much alcohol ethyl alcohol is contained in a given volume of an alcoholic beverage.

Ethanol is used in medical wipes and in most common antibacterial hand sanitizer gels at a concentration of about 62% v/v as an antiseptic. Ethanol kills organisms by denaturing their proteins and dissolving their lipids and is effective against most bacteria and fungi, and many viruses, but is ineffective against bacterial spores.

Ethanol can be prepared by the fermentation of molasses. This is a biochemical process in which enzymes react to degrade biomass. Reduction, polymerization and oxidation reactions doesn't necessarily need

Ethanol is used to prepare acetaldehyde.

Ethanol burns to produce carbon dioxide and water and can be used as a fuel on its own or in mixtures with petrol (gasoline). "Gasohol" is a petrol/ethanol mixture containing approximately $10\%$-$20\%$ ethanol.

Alcoholic fermentation converts one mole of sucrose into two moles of ethyl alchohol, also known as ethanol and two moles of carbon dioxide, producing two moles of ATP in the process. The overall chemical reaction for fermentation of alcohol is as follow:

In the laboratory, Absolute alcohol is prepared by keeping the rectified spirit in contact with calculated amount of quick lime $(CaO)$ for a few hours and then refluxing and distilling it.

Power alcohol is 20 : 80 mixture of absolute alcohol and petrol.
It is used to generate power.
Power alcohol is an additive to motor fuels to act as fuel for internal combustion engine.

Absolute alcohols (100% ethanol) are prepared from rectified spirit (95% ethanol) by mixing a suitable amount of benzene and subjected to fractional distillation (azeotropic distillation).

Absolute alcohol can be prepared from rectified spirit by azeotropic distillation. Absolute alcohol is 100% pure alcohol. Rectified spirit contains 95.87% ethanol and 4.13% water. It is a constant boiling mixture having boiling point 78.13 $^oC$.

Denatured alcohol, also called methylated spirits or denatured rectified spirit, is ethanol that has additives to make it poisonous. Rest are made from methane.

A rectified spirit is a mixture with a composition of ethanol (95%) and water (5%). Using quicklime $(CaO)$ to absorb water content and finally contacting the solution with anhydrous copper sulphate removes the leftover traces of water that leaves absolute alcohol. 

Methylated spirit is $10\%$ methanol and $90\%$ ethanol which is denatured alcohol used as a solvent and as fuel which is not fit for drinking as it is highly toxic in nature.