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Question Bank [2022] — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryQuestion Bank [2022]3 Marks
Question
Write a reaction to distinguish acetaldehyde from acetone
✓

Answer

Tollens’ reagent test: Acetaldehyde being an aldehyde reduces Tollens’ reagent to shining silver mirror, whereas propanone being acetone does not.

$
\begin{array}{c}
\underset{\text { Acetaldehyde }}{ CH _3 CHO }+\underset{\text { Tollens' reagent }}{2\left[ Ag \left( NH _3\right)_2\right]^{+}}+3 OH ^{-} \longrightarrow \underset{\text { Acetate ion }}{ CH _3 COO ^{-}}+\underset{\text { Silver metal }}{2 Ag \downarrow}+4 NH _3+2 H _2 O \\
\underset{\text { Acetone }}{ CH _3 COCH _3 \stackrel{\text { Tollens 'reagent }}{\longrightarrow} \text { No silver mirror }}
\end{array}
$

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