Write the molecular formula of ethanol.

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$C_{2} H_{5} OH$

$CHOH$

${CH}_{3} OH$

$CHCOOH$

answer is A.

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Detailed Solution

The most prevalent alcohol in organic chemistry is ethanol. Its main application is as a solvent. Use the IUPAC's fundamental nomenclature principles to get the molecular formula of ethanol.

A molecular formula is a condensed version of the structural elements that make up any chemical substance.
We will go over some fundamental IUPAC nomenclature principles in order to ascertain the molecular formula.

The prefix of the provided compound is "eth," which, according to IUPAC, stands for the designation of any compound with two carbon atoms in the primary parent chain. So, ethanol contains two carbon atoms.

Since the suffix in this case is "-ol," it is clear from the suffix that alcohol is the predominant functional group present. This demonstrates that a hydroxyl group has taken the position of one hydrogen atom (OH).
- Since carbon is a tetravalent atom, hydrogen should complete the missing valency. So, a parent chain with two carbon atoms should include six hydrogen atoms.

Ethanol is the most common alcohol in organic chemistry. It is commonly used as a solvent.

A molecular formula is the short representation of a chemical compound.

The molecular formula of ethanol is $C_{2} H_{5} OH$ .

Hence option A is correct.

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