Question

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

Answer 1

Given the 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 linked with only single bonds in the main carbon chain and the secondary suffix is -oic acid, so the funtional group is carboxylic acid (-COOH).

The position of the funtional group is on the first carbon (-1-oic acid).
Therefore the structural formula is ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2{\text{CH}}_2\text{COOH}$.