The molecular formula of ethanol is:
A. $(CH_{ 3 })_{ 2 }CHOH$
B. $C_{ 2 }H_{ 5 }OH$
C. $CH_{ 3 }OH$
D. $CH_{ 3 }CH_{ 2 }CH_{ 2 }OH$

Hint: Ethanol is the most common alcohol in organic chemistry. Just recall some basic nomenclature rules of IUPAC. Try to apply these nomenclature rules on the organic compounds in the option given.

Complete step by step answer:

Let’s look at the options one by one,
The organic compound given in option A is isopropyl alcohol. This is alcohol attached to an alkyl group, which is an isopropyl group.
The organic compound given in option B is ethyl alcohol (ethanol). This is alcohol attached to an alkyl group, which is an ethyl group.
The organic compound given in option C is methyl alcohol (methanol). This is alcohol attached to an alkyl group, which is a methyl group.
The organic compound given in option D is propyl alcohol (propanol). This is alcohol attached to an alkyl group, which is a propyl group.

Therefore, we can conclude that the correct answer to this question is option B.

Note: Let’s see some other points related to this question -
IUPAC - The International Union of Pure and Applied Chemistry is an international federation of National Adhering Organizations that represents chemists in individual countries. It is a member of the International Science Council.
Uses of ethanol - Ethanol is used extensively as a solvent in the manufacture of varnishes and perfumes; as a preservative for biological specimens; in the preparation of essences and flavorings; in many medicines and drugs; as a disinfectant and in tinctures (e.g., tincture of iodine); and as a fuel and gasoline additive.