Question:

To differentiate between pentan-$2$-one and pentan-$3$-one a test is carried out. Which of the following is the correct answer?

Updated On: Jul 7, 2022
  • Pentan-$2$-one will give silver mirror test
  • Pentan-$2$-one will give iodoform test
  • Pentan-$3$-one will give iodoform test
  • None of these
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The Correct Option is B

Solution and Explanation

Only methyl ketone group gives positive iodoform so compound pentan-$2$-one will give iodoform test and pentan-$3$-one will not give. silver mirror is only valid for aldehyde group, not for ketone.
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Notes on Aldehydes, Ketones and Carboxylic Acids

Concepts Used:

Aldehydes, Ketones, and Carboxylic Acids

Aldehydes, Ketones, and Carboxylic Acids are carbonyl compounds that contain a carbon-oxygen double bond. These organic compounds are very important in the field of organic chemistry and also have many industrial applications.

Aldehydes:

Aldehydes are organic compounds that have the functional group -CHO.

Preparation of Aldehydes

Acid chlorides are reduced to aldehydes with hydrogen in the presence of palladium catalyst spread on barium sulfate.

Ketones:

Ketones are organic compounds that have the functional group C=O and the structure R-(C=O)-R’.

Preparation of Ketones

Acid chlorides on reaction with dialkyl cadmium produce ketones. Dialkyl cadmium themselves are prepared from Grignard reagents.

Carboxylic Acid:

Carboxylic acids are organic compounds that contain a (C=O)OH group attached to an R group (where R refers to the remaining part of the molecule).

Preparation of Carboxylic Acids

Primary alcohols are readily oxidized to carboxylic acids with common oxidizing agents such as potassium permanganate in neutral acidic or alkaline media or by potassium dichromate and chromium trioxide in acidic media.