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  4. The reagent with which both acetaldehyde and acetone react easily is

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Q. The reagent with which both acetaldehyde and acetone react easily is

AMUAMU 2001

Solution:

Acetaldehyde and acetone react with Grignard reagent. Acetaldehyde gives the secondary alcohol with Grignard reagent while acetone gives tertiary alcohol with Grignard reagent.
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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}} \longrightarrow $ pink colour
$R- CHO +\underset{\text{Tollen's reagent}}{ Ag _{2} O } \xrightarrow{\Delta} R \cdot COOH + \underset{\text{silver mirror}}{2Ag}$
$R- CHO +\underset{\text{blue Fehling's solution}}{2 CuO} \xrightarrow{\Delta}R \cdot COOH + \underset{\text{red ppt}}{Cu_2O}$