PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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Solution for Give Simple Chemical Tests to Distinguish Between the Following Pairs of Compounds: Ethanal and Propanal - PUC Karnataka Science Class 12 - Chemistry

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Question

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

Ethanal and Propanal

 

Solution 1

(i) Distinguish test between ethanal and propanal:

Iodoform Test: Ethanal gives iodoform test.

CH3CHO + 4NaOH + 3I2 → CHI3 (Yellow ppt.) + HCOONa + 3NaI + 3H2O

Propanal does not give this test.

CH3CH2CHO + 4NaOH + 3I2 → No Reaction.

Solution 2

Ethanal and propanal can be distinguished by iodoform test.

Iodoform test

Aldehydes and ketones having at least one methyl group linked to the carbonyl carbon atom responds to the iodoform test. Ethanal having one methyl group linked to the carbonyl carbon atom responds to this test. But propanal does not have a methyl group linked to the carbonyl carbon atom and thus, it does not respond to this state.

`CH_3CHO + 3NaOI -> HCOONa         +        CHI_3  + 2NaOH`

Ethanal                         Sodium methanoate           Iodoform(yellow ppt)

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APPEARS IN

 NCERT Chemistry Textbook for Class 12 Part 2 (with solutions)
Chapter 12: Aldehydes, Ketones and Carboxylic Acids
Q: 13.7 | Page no. 378
Solution for question: Give Simple Chemical Tests to Distinguish Between the Following Pairs of Compounds: Ethanal and Propanal concept: Aldehydes and Ketones - Chemical Reactions of Aldehydes and Ketones - Oxidation. For the courses PUC Karnataka Science, CBSE (Science)
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