Identify the functional groups in the following compounds and name them.
(i) 
(ii) 
(iii) CH3CH2CH2OH
(iv) HCHO
(i) –COO- group (carboxylic acid; the anion is called carboxylate ion)
(ii)
ester group (
)
(iii) –OH group – alcohol
(iv) –CHO group - aldehyde
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