CBSE (Science) Class 12CBSE
Share
Notifications

View all notifications

Give Simple Chemical Tests to Distinguish Between the Following Pairs of Compounds. Benzaldehyde and Acetophenone - CBSE (Science) Class 12 - Chemistry

Login
Create free account


      Forgot password?

Question

Give simple chemical tests to distinguish between the following pairs of compounds.

Benzaldehyde and Acetophenone

Solution

Benzaldehyde and acetophenone can be distinguished by the following tests.

Tollen’s Test

Aldehydes respond to Tollen’s test. Benzaldehyde being an aldehyde reduces Tollen’s reagent to give a red-brown precipitate of Cu2O, but acetophenone being a ketone does not.

`C_6H_5CHO +   2[Ag(NH_3)_2]^(+)  + 3OH^(-)  ->  C_6H_5COO^(-)  +  Ag darr + 4NH_3  + 2H_2O`

Benza;dehyde          Tollen's reagent                          benzoate ion       Silver mirror

Iodoform test

Acetophenone being a methyl ketone undergoes oxidation by sodium hypoiodite (NaOI) to give a yellow ppt. of iodoform. But benzaldehyde does not respond to this test.

`C_6H_5COCH_3 + 3NaOI  -> C_6H_5COONa  +       CHI_3 + 2NaOH`

Acetophenone                          Sodium benzoate           Iodoform (yellow ppt)

  Is there an error in this question or solution?

APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 12 (2018 to Current)
Chapter 12: Aldehydes, Ketones and Carboxylic Acids
Q: 13.6 | Page no. 378
Solution Give Simple Chemical Tests to Distinguish Between the Following Pairs of Compounds. Benzaldehyde and Acetophenone Concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Oxidation.
S
View in app×