CH_3CHO and C_6H_5CH_2CHO can be distinguishe | vedclass

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(B) $CH_3CHO$ and $C_6H_5CH_2CHO$ are both aldehydes and react with Tollen's reagent,Fehling's solution,and Benedict's solution,so these cannot distin

Vedclass · Accepted Answer

Iodoform test

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(B) $CH_3CHO$ and $C_6H_5CH_2CHO$ are both aldehydes and react with Tollen's reagent,Fehling's solution,and Benedict's solution,so these cannot distinguish them.$CH_3CHO$ contains a $CH_3CO-$ group,which gives a positive Iodoform test with $I_2$ and $NaOH$,forming a yellow precipitate of $CHI_3$.$CH_3CHO + 3 I_2 + 4 NaOH \longrightarrow CHI_3 (	ext{yellow ppt}) + HCOONa + 3 NaI + 3 H_2O$$C_6H_5CH_2CHO$ does not contain the $CH_3CO-$ group and does not give the Iodoform test.$	herefore$ The Iodoform test is the correct method to distinguish between them.

$CH_3CHO$ and $C_6H_5CH_2CHO$ can be distinguished chemically by

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