Write the structural formula for pentan-1-oic acid.

• Given IUPAC name is pentan-1-oic acid.
• Since the root word is pent, there will be five carbons in the parent chain.
• The primary suffix is –an-, all the carbon atoms are linked with only single bonds in the main carbon chain and the secondary suffix is –oic acid, so the functional group is a carboxylic acid (-COOH).
• The position of the functional group is on the first carbon (-1-oic acid).
• Therefore, the structural formula is $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}COOH$