What happens when acetone reacts with iodine and base?

Asked By: Julianna Parrinhas | Last Updated: 31st March, 2020
Category: science chemistry
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Acetone reacts with halogens, like iodine, in haloform reactions, which is where a ketone is mixed with a halogen and a base. Here, a ketone (like acetone) is exposed to a base, which removes hydrogen. The ketone then reacts with the halogen.

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Hereof, what happens when acetone is heated with alkaline solution of iodine?

(a) On heating acetone with alkaline solution of Iodine, iodoform is obtained. (b) When chlorobenzene is heated in presence of conc. (c) When chlorobenzene is heated with sodium metal in presence of ether, diphenyl is produced.

Also, what reacts with alkaline aqueous iodine? In the first mixture, the iodine reacts with the sodium hydroxide solution to produce some sodium iodate(I). This is an oxidising agent. Sodium chlorate(I) is alkaline because it reacts reversibly with water to form the weak acid chloric(I) acid together with hydroxide ions.

Also Know, does acetone give iodoform test?

The only aldehyde able to undergo this reaction is acetone because it is the only aldehyde with a methyl attached to the alpha position of the carbonyl. Only one aldehyde and only one primary alcohol give a positive iodoform test.

What happens when acetone reacts with HCN?

When acetone react with HCN it gives the nucleophilic addition product know as acetone cyanohydrin. The product have both affinity towards oxidation as well as reduction that depends on reactant used .

32 Related Question Answers Found

What is iodoform test?

Iodoform Test. Iodoform test is used to check the presence of carbonyl compounds with the structure R-CO-CH3 or alcohols with the structure R-CH(OH)-CH3 in a given unknown substance. The reaction of iodine, a base and a methyl ketone gives a yellow precipitate along with an “antiseptic” smell.

Will 2 pentanone give a positive iodoform test?

Iodo form test is used for the identification of aldehyde and ketone having CH3CO group. Positive iodoform test is given by compounds containing methyl keto group which is CH3−CO group. Among all options, 2-pentanone is the only compound containing CH3CO group. Hence, option B is correct.

Which alcohol gives a positive iodoform test?

Ethanol is the only primary alcohol to give the triiodomethane (iodoform)reaction. If "R" is a hydrocarbon group, then you have a secondary alcohol. Lots of secondary alcohols give thisreaction, but those that do all have a methyl group attached to the carbon with the -OH group.

Which compounds do not give iodoform test?

The compound containing methyl keton group( -COCH3) or under oxidation give methyl ketone group undergo iodoform reaction. In above question only methanal doesnt have methyl ketone group so it will not undergo positive iodoform test.

Is acetone a methyl ketone?


Ketones. A ketone is a compound containing a carbonyl group with two hydrocarbon groups attached to it. Two of the simplest are propanone, marketed under the name acetone, and 2-butanone, marketed under the name methyl ethyl ketone or MEK. An important ketone is fructose, or fruit sugar.

What is iodoform used for?

Iodoform. Iodoform, also called triiodomethane, a yellow, crystalline solid belonging to the family of organic halogen compounds, used as an antiseptic component of medications for minor skin diseases.

How will you distinguish between acetaldehyde and acetone?

A functional group is a portion of atoms and is a group of atoms that determines the properties of the molecule. Both acetaldehyde and acetone are liquid compounds at room temperature and pressure. The main difference between acetaldehyde and acetone is that acetaldehyde is an aldehyde whereas acetone is a ketone.

What is Haloform test?

The haloform reaction is the reaction of a methyl ketone with chlorine, bromine, or iodine in the presence of hydroxide ions to give a carboxylate ion and a haloform. There is one aldehyde that undergoes the haloform reaction, which is acetaldehyde.

What does a positive iodoform test look like?

A positive result - the pale yellow precipitate of triiodomethane (iodoform) - is given by an aldehyde or ketone containing the grouping: Lots of ketones give this reaction, but those that do all have a methyl group on one side of the carbon-oxygen double bond. These are known as methyl ketones.

Why do ketones not react with tollens reagent?


Nope. The Tollens reaction is oxidation of the aldehyde carbonyl C-H bond to a carboxylic acid by silver ions. Ketones don't have carbonyl C-H bonds. Therefore they cannot be oxidized by the Tollens reagent.

Which compounds will produce a yellow precipitate with alkaline aqueous iodine?

Methyl ketone or compound which gives methyl ketone on reaction with halogen in presence of alkali gives the haloform test. Iodoform is best because CHI3 is yellow coloured solid. The compounds which give yellow precipitate with iodine and alkali: Ketone: R-CO- CH3 (R=alkyl group).

What happens when ethyl alcohol is treated with alkaline solution of iodine?

The two substances can be distinguished from each other by the fact that ethanol in contrast to methanol reacts with alkaline iodine/potassium iodide solution forming a yellow precipitate. The yellow precipitate consists of triiodomethane, which can be shown to be a halogenated alkane by the Beilstein test.

How can you distinguish between methanol and ethanol?

Iodoform is a type of test that can used to differentiate between methanol and ethanol. When ethanol is warmed with Iodine in the presence of Naoh, it forms a yellow colored precipitate. Methanol on the other hand does not react positively to iodoform test.

Is iodoform the same as iodine?

Iodoform is an organoiodine compound with the formula CHI3 and a tetrahedral molecular geometry. Iodoform is soluble in fatty acids and decomposes releasing iodine in nascent state (96,7% of iodine) when in contact with secretions or endodontic infections 2.

What is a methyl ketone?


A methyl ketone is a ketone in which a methyl group is attached to the carbonyl group.

Why formaldehyde does not give iodoform?

Formaldehyde has no beta hydrogens to deprotonate (both hydrogens are directly attached to the carbonyl carbon), so they will not deprotonate, and will therefore not undergo the iodoform test.

What happens when ethanol is heated with iodine in presence of AQ Naoh?

Explanation: The formation of a pale yellow precipitate when iodine in sodium hydroxide reacts with an alcohol that can be oxidized to acetaldehyde or a methyl ketone is the iodoform reaction.