Identify the functional group in CH₃CHO. Write its common name and IUPAC name.

(i) The functional group in CH₃CHO is the aldehyde group (—CHO).

(ii) CH₃CHO contains 2 atoms and is, therefore, named as derivative of ethane.

(iii) Since CH₃CHO is an aldehyde, the suffix -e of ethane is replaced by the suffix-al.

(iv) The IUPAC name of CH₃CHO is Ethanal.

(v) The common name of CH₃CHO is
Acetaldehyde.