(a) Draw the structural diagram for the following organic compounds.

(a) Structural diagrams:

1. ethanal (CH₃CHO)

2. acetic acid (CH₃COOH)

3. 2-bromopropane (CH₃CHBrCH₃)

(b) IUPAC names:

1. 2-methylbutane
2. Prop-1-ene (propene)