MCQ
To distinguish between formaldehyde and acetaldehyde, we require
  • A
    Tollen's reagent
  • B
    Fehling's solution
  • C
    Schiff's reagent
  • Caustic soda solution

Answer

Correct option: D.
Caustic soda solution
d
(d) $2HCHO\mathop {\xrightarrow{{NaOH}}}\limits_{Conc.} C{H_3}OH + HCOONa$

          It is aldol condensation reaction.

$2C{H_3}CHO\mathop {\xrightarrow{{NaOH}}}\limits_{dil} C{H_3} - \mathop {\mathop {CH}\limits^{|\,\,\,\,\,\,} }\limits^{OH}  - C{H_2} - CHO$

          It is aldol condensation reaction.

 

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