Which of the following functional groups is present in propanal? ((A)) –OH ((B)) –COOH ((C)) –CHO ((D)) –CO–

Question

Which of the following functional groups is present in propanal?
((A)) –OH
((B)) –COOH
((C)) –CHO
((D)) –CO–

Accepted Answer

## Model Answer **(C) –CHO** Propanal belongs to the aldehyde class (suffix *-al*), so it contains the **–CHO** (aldehyde) functional group. Source: Chapter 4, Table 4.3 and Table 4.4 --- ## Explanation The suffix **-al** in "propanal" directly indicates an aldehyde functional group (–CHO). Remember: –OH = alcohol, –COOH = carboxylic acid, –CO– (flanked by two carbon chains) = ketone. Examiners expect you to link the IUPAC suffix to the correct functional group.

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