Question
Which functional group can be detected by using sodium hydrogen carbonate test?

Answer

Carboxylic acid (-COOH) can be detected by using sodium hydrogen carbonate. Carboxylic acids reacts with sodium hydrogen carbonate to produce carbon dioxide gas which can be seen in the form of a brisk effervescence.
$ \underset{\text {Carboxylic acid}}{RCOOH} +  NaHCO_2  \rightarrow \underset{\text {Brisk effervescence}}{ RCOONa} +  CO_2(g) + H _2 O$

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