Classification of Organic Compounds — Prelims Questions

Which of the following compounds is an example of an aromatic heterocyclic compound?

Identify the functional group present in $CH_3CH_2CHO$.

Which of the following statements about a homologous series is INCORRECT?

Which of the following compounds is an alkyne?

Which of the following functional groups contains a carbonyl group?

Which of the following compounds is classified as a primary amine?