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Aldehydes, Ketones And Carboxylic Acids

Question
CBSEENCH12011158
Wired Faculty App

CH3CHO and C6H5CH2CHO can be distinguished chemically by

  • Benedict test

  • Iodoform test

  • Tollen's reagent test

  • Fehling solution test

Solution

B.

Iodoform test

CH3CHO and C6H5CH2CHO both being aliphatic aldehydes react with Tollen's reagent, Fehling solution and Benedict solution. So, these reagents cannot be used to distinguish them. CH3CHOreacts with  NaOH and I2 to give yellow crystals of iodoform while C6H5CH2CHO does not react with it.
CH3CHO +3I2 4 NaOH → CHI3 +HCOONa +3NaI +3H2O
C6H5CH2CHO +I2  +4NaOH → No reaction
Thus, CH3CHO and C6H5CH2CHO can be distinguished by iodoform test. 

Some More Questions From Aldehydes, Ketones and Carboxylic Acids Chapter

Write the structures of products of the following reactions:


    

Arrange the following compounds in increasing order of their boiling points:
CH3CHO, CH3CH2OH, CH3OCH3, CH3CH2CH3.

Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions:    
Ethanal, Propanal, Propanone, Butanone.

Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions:    
Benzaldehyde, p-Tolualdehyde, p-Nitrobenzaldehyde, Acetophenone.

Predict the products of the following reactions:

Predict the products of the following reactions:

Predict the products of the following reactions:

Predict the products of the following reactions:

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