HCHO and HCOOH are detected by: - Vidyadip

MCQ

$\text{HCHO}$ and $\text{HCOOH}$ are detected by:

✓
$ \mathrm{NaHCO}_3 $
B
$ \mathrm{CuSO}_4 / \mathrm{NaOH} $
C
$ \mathrm{AgNO}_3 / \mathrm{NH}_4 \mathrm{OH}$
D
All of these

✓

Answer

Correct option: A.

$ \mathrm{NaHCO}_3 $

Both $\text{HCHO}$ and $\text{HCOOH}$ react with $\ce{AgNO_3/NH_4OH}$
$\ce{CuSO_4/NaOH}$ solution. But $\ce{HCOOH}$ gives effervescences of $\ce{CO_2}$ when reacts with $\ce{NaHCO_3}$, whereas $\ce{HCHO}$ does not give any effervescence of $\ce{CO_2}$ when reacts with $\ce{NaHCO_3}$.
$\ce{HCOOH + NaHCO_3 \rightarrow HCOONa + H_2O + CO_2 \uparrow}$

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