Naming compounds by functional groups

Steps:

• First compound shows -OH attached to CH3-, indicating methanol (simplest alcohol).
• Second compound shows -COO- linkage with CH3- on carbonyl and -CH2CH3- on oxygen, indicating ester from ethanoic acid and ethanol.
• Ester naming: alkyl from alcohol (ethyl) + oate from acid (ethanoate).
• Match names to option C.

Why C is correct:

• Methanol (CH3OH) and ethyl ethanoate (CH3COOCH2CH3) directly correspond to alcohol and ester structures per IUPAC rules.

Why the others are wrong:

• A: Methanoic acid (HCOOH) is a carboxylic acid, not an alcohol.
• B: Ethyl methanoate (HCOOCH2CH3) uses methanoic acid, mismatching the two-carbon acyl group.
• D: Methanal (HCHO) is an aldehyde, not an alcohol.

Final answer: C