Check sibling questions

(i) Define the term functional group. Identify the functional group present in the following:

(ii) What happens when 5% alkaline KMnO 4 solution is added drop by drop to warm ethanol taken in a test-tube? State the role of alkaline KMnO 4 solution in this reaction.

 

Answer

(i) A functional group is a heteroatom or a group of atoms attached to the carbon chain which gives certain characteristic properties to a compound.

Structure of Formaldehyde - Teachoo.png

In the compound given above, there is an oxygen atom attached to the carbon atom through a double bond. 

So, the functional group is ketone.  

 

In the compound given above, there is an oxygen atom attached to the carbon atom through a double bond and an OH group attached through a single bond to the same carbon atom.

So, the functional group is carboxylic acid .

(ii) Alkaline KMnO 4 is an oxidising agent. On reaction with ethanol, KMnO 4 oxidises it to ethanoic acid and the reaction that takes place is as follows:

Reaction of Ethanol with Oxidizing Agent. - Teachoo.png

 

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Transcript

Reaction of Ethanol with Oxidizing Agent Ethanol Oxygen (from the oxidizing agent) Oxidation Alkaline KMNO4 Acidified K2Cr2O7 Ethanoic acid

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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo