Write the chemical structural formulae for the following compounds. Write the functional group each one of these o homologous series.

Here are the answers to Question Three and Question Four.

Question Three: Write the chemical structural formulae for the following compounds.

i. Butane

$$CH_3-CH_2-CH_2-CH_3$$

ii. Propanoic acid

$$CH_3-CH_2-COOH$$

iii. Ethyne

$$HC \equiv CH$$

iv. Ethanol

$$CH_3-CH_2-OH$$

Question Four: Write the functional group each one of these homologous series.

i. Alkanols: Hydroxyl group ($-OH$)

ii. Carboxylic acids: Carboxyl group ($-COOH$)

iii. Aldehydes: Aldehyde group ($-CHO$ or $-C(=O)H$)

iv. Ketones: Carbonyl group ($-C(=O)-$, where the carbon is bonded to two other carbon atoms)

v. Alkanes: Carbon-carbon single bonds (no specific functional group in the same sense as the others, characterized by C-C and C-H single bonds)