Question

The reagent with which both acetaldehyde and acetone react easily is

• A. Schiff s reagent
• B. Tollens reagent
• C. Grignard reagent
• D. Fehling solution

Answer 1

Answer: (C)

Acetaldehyde and acetone react with Grignard reagent. Acetaldehyde gives the secondary alcohol with Grignard reagent while acetone gives tertiary alcohol with Grignard reagent.


But with Schiff's reagent, Tollen' s reagent, and Fehling's solution only acetaldehyde reacts. (Acetone does not react with these reagents)
$R-CHO+\underset{\text{(colourless)}}{\text{Schiffs reagent}}⟶$ pink colour
$R-CHO+\underset{\text{Tollen’s reagent}}{A{g}_{2}O}\stackrel{\Delta }{\to }R\cdot COOH+\underset{\text{silver mirror}}{2Ag}$
$R-CHO+\underset{\text{blue Fehling’s solution}}{2CuO}\stackrel{\Delta }{\to }R\cdot COOH+\underset{\text{red ppt}}{C{u}_{2}O}$