Question

$C{H}_{3}COC{H}_3$ and $C{H}_{3}C{H}_{2}CHO$ can be distinguished by

• A. Neutral $FeC{l}_3$
• B. Tollen's reagent
• C. $NaHS{O}_3$
• D. $2,4-DNP$

Answer 1

Answer: (B)

By neutral ${\text{FeCl}}_{\text{3}}$ only allylic and phenol can be distinguished.

By ${\text{NaHSO}}_3$ and 2,4-DNP: ketone and aldehyde both can give test.

Ketone and aldehyde can be distinguished by Tollen's reagent, Fehling's solution and Schiff's reagent.

$C{H}_{3}COC{H}_3$ (ketone) and $C{H}_{3}C{H}_{2}CHO$ (aldehyde) can be distinguished by Tollen's reagent. $C{H}_{3}C{H}_{2}CHO$ reacts with Tollen's reagent to give silver mirror while $C{H}_{3}COC{H}_3$ does not react.



${\text{CH}}_3{\text{COCH}}_3+{\text{Ag}}_2\text{O}\stackrel{\Delta }{\to }\text{No reaction}$