The organic compound which when mixed with ethyl alcohol, (ethanol) makes a spurious:
A. methanol
B. methanoic acid
C. methanal
D. ethanoic acid

Hint: In chemistry, alcohol is an organic compound that carries at least one hydroxyl functional group.Pyridine, methanol, or both can be added to make denatured alcohol poisonous, and denatonium can be added to make it bitter.

Complete step by step solution:
Methanol is an alcohol, which is nearly new by huge qualities to create alcoholic liquors and beverages all over the world.
- Drinking more methanol content destroys the kidney and other organs of the body too.
-Therefore to deliver the lives of people, the government controls its production on a large scale.
- This is done by declaring it unfit for drinking and by the insertion of poisonous substances like methanol.
- Problems appear when higher concentrations are created mistakenly in the distillation processes.
- But especially when methanol is intentionally added to create spirits and illicit alcoholic drinks.

Hence, the correct option is A. Methanol.

Additional Information:
The methanol derived from wood is used chiefly for rendering industrial ethyl alcohol unfit to drink.

Note:
Methanol is utilized as a feedstock to create synthetic compounds, for example, acidic corrosive and formaldehyde, which thusly are utilized in items like cements, froths, pressed wood subfloors, solvents and windshield washer liquid.Mixture ethanol with small amount of methanol called as a spurious alcohol. Methanol is also a high-octane, clean-burning fuel that is a potentially important substitute for gasoline in automotive vehicles. The methanol derived from wood is used chiefly for rendering industrial ethyl alcohol unfit to drink.