Sage-Tips

Which of the following compounds will produce a positive iodoform test?

The answer is (C) 2-hexanone.

Which type of alcohol will give a positive result with the iodoform test?

Ethanol is the only primary alcohol to give the triiodomethane (iodoform) reaction.

What compounds does the iodoform test identify?

Iodoform Test can be used to identify the presence of carbonyl compounds group in alcohols. The reaction of Iodine along with the base with methyl ketones results in the appearance of a very pale yellow precipitate of triiodomethane (previously known as iodoform).

What is meant by iodoform test?

Iodoform Test can be used to identify the presence of carbonyl compounds group in alcohols. The reaction of Iodine along with the base with methyl ketones results in the appearance of a very pale yellow precipitate of triiodomethane (previously known as iodoform). CHI3.

Which of the following gives positive iodoform test and positive Fehling’s solution test?

The compound which contains COCH3 group in its structure, give positive iodoform test and the compound which contains CHO group give positive Fehling test. In ethanal,CH3CHO both the groups are present, hence it responds to both iodoform test and Fehling’s test.

Which of the following compounds will not give a positive iodoform test?

The only aldehyde that gave the positive iodoform test is acetaldehyde because acetaldehyde only contains the required functional group that is \[{\text{C}}{{\text{H}}_3}{\text{C}} = {\text{O}}\] . Other aldehydes have higher hydrocarbon chains and hence do not give positive iodoform test.

What is the positive result of iodoform test?

A positive result is the appearance of a very pale yellow precipitate of triiodomethane (previously known as iodoform) – CHI3. Apart from its color, this can be recognised by its faintly “medical” smell. It is used as an antiseptic on the sort of sticky plasters you put on minor cuts, for example.

Which compounds give iodoform test how would you do the order form test in laboratory?

Compounds That Give Positive Iodoform Test

• Acetaldehyde.
• Methyl Ketones.
• Ethanol.
• Secondary Alcohols that contain Methyl Groups in Alpha Position.

What observation indicates a positive iodoform test?

A positive result is indicated by the appearance of a yellow precipitate (m.p. = 119–121 °C) with a characteristic medicinal odor.

Which compound gives both iodoform and Fehling’s test?

Explanation: CH₃CHO gives test for aldehyde (Fehling’s test) and iodoform test.

Which of the following compound can give both Fehling and iodoform test?

In ethanal,CH3CHO both the groups are present, hence it responds to both iodoform test and Fehling’s test.

Which of the following compounds gives positive iodoform test?

The compounds which give positive iodoform test are the ones with Alpha methyl groups. To be more precise, Ethanal (Acetaldehyde) and methyl ketones. Ethanal is the only aldehyde which gives positive iodoform test. Thus, ketone and aldehyde with struc

What is iodoform test for alpha methyl groups?

Alpha means that it is directly attached to the carbon with the functional group. The reagents used are iodine and sodium hydroxide (NaOH). The compounds which give positive iodoform test are the ones with Alpha methyl groups. To be more precise, Ethanal (Acetaldehyde) and methyl ketones.

What is the difference between haloform and iodoform test?

All methyl group having ketones give haloform test and all methyl group having aldehydes (acetaldehyde) gives haloform test and ethyl alcohol, isopropyl alcohol,sec butyl alcohol, acetaldehyde, acetone,3–pentanone … etc gives iodoform test Iodoform test is given by compounds containing -COCH3 group.

What is the iodoform test for I2 NaOH?

Answer Wiki. Any compounds containing the CH3C=O group or the CH3CH(OH) group give a positive result with the iodoform test. When I2 and NaOH is added to a compound containing one of these groups, a pale yellow precipitate of iodoform (triiodomethane) is formed.