Answer
365.4k+ views
Hint :Iodoform is an iodine containing organic compound with molecular formula $ CH{I_3} $ . It is a crystalline solid that has a characteristic pale yellow colour and distinct odour. Iodoform test is used to determine the presence of $ C{H_3}CO $ or $ C{H_3}CH(OH) $ groups in the given organic compound. It is a test given by certain aldehydes, ketones, and secondary alcohols.
Complete Step By Step Answer:
Iodoform test is given by aldehydes, ketones, secondary alcohols that have an alpha methyl group attached to the carbon containing functional group. It tests the presence of $ C{H_3}CO $ and $ C{H_3}CH(OH) $ . When iodine reacts with a base (NaOH) and the carbonyl group of the organic compound, it forms a yellow precipitate which is iodoform. Below is an example of an iodoform test.
Now, let us examine the given compounds.
(A)
It is a secondary alcohol and undergoes iodoform test since it contains $ C{H_3}CH(OH) $ group.
(B)
Compound contains the $ C{H_3}CH(OH) $ group and therefore gives positive results for the iodoform test.
(C)
$ 2 - $ Butanol also contains $ C{H_3}CH(OH) $ group and hence a yellow precipitate of iodoform is formed.
(D)
Ethanol is the only primary alcohol that gives an iodoform test.
(E)
It does not contain any alpha methyl group. Iodoform is not formed when the given compound reacts with NaOH and $ {I_2} $ . There is no $ C{H_3}CO $ or $ C{H_3}CH(OH) $ group.
Therefore, the right option is (E) Diphenyl methanol.
Note :
Iodoform also known as triiodomethane or carbon triiodide has a distinct odour that is similar to chloroform. It has antimicrobial properties and is used as disinfectant. It is also used as an antiseptic.
Acetaldehyde is the only aldehyde that gives positive iodoform test.
Iodoform test is an important reaction used for the production of iodoform.
Complete Step By Step Answer:
Iodoform test is given by aldehydes, ketones, secondary alcohols that have an alpha methyl group attached to the carbon containing functional group. It tests the presence of $ C{H_3}CO $ and $ C{H_3}CH(OH) $ . When iodine reacts with a base (NaOH) and the carbonyl group of the organic compound, it forms a yellow precipitate which is iodoform. Below is an example of an iodoform test.
![seo images](https://www.vedantu.com/question-sets/6cf97155-2d87-4516-ad41-7daf3827f08e8311969366841450671.png)
Now, let us examine the given compounds.
(A)
![seo images](https://www.vedantu.com/question-sets/147c2088-afe4-4b7e-8c52-dd47a2e2bd19568949152495577318.png)
It is a secondary alcohol and undergoes iodoform test since it contains $ C{H_3}CH(OH) $ group.
(B)
![seo images](https://www.vedantu.com/question-sets/6742fff8-71cc-45c0-b075-ba14f104974b8376921425427109722.png)
Compound contains the $ C{H_3}CH(OH) $ group and therefore gives positive results for the iodoform test.
(C)
![seo images](https://www.vedantu.com/question-sets/a1a4a47e-81a8-4494-864a-3df4358044d64245781267914726413.png)
$ 2 - $ Butanol also contains $ C{H_3}CH(OH) $ group and hence a yellow precipitate of iodoform is formed.
(D)
![seo images](https://www.vedantu.com/question-sets/9c768874-8df4-480c-8821-3b01434bbad58763061483451923830.png)
Ethanol is the only primary alcohol that gives an iodoform test.
(E)
![seo images](https://www.vedantu.com/question-sets/351c7f37-44b6-47e4-84d0-5f03789fa79c4466375147871581549.png)
It does not contain any alpha methyl group. Iodoform is not formed when the given compound reacts with NaOH and $ {I_2} $ . There is no $ C{H_3}CO $ or $ C{H_3}CH(OH) $ group.
Therefore, the right option is (E) Diphenyl methanol.
Note :
Iodoform also known as triiodomethane or carbon triiodide has a distinct odour that is similar to chloroform. It has antimicrobial properties and is used as disinfectant. It is also used as an antiseptic.
Acetaldehyde is the only aldehyde that gives positive iodoform test.
Iodoform test is an important reaction used for the production of iodoform.
Recently Updated Pages
Mark and label the given geoinformation on the outline class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
When people say No pun intended what does that mea class 8 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Name the states which share their boundary with Indias class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give an account of the Northern Plains of India class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Advantages and disadvantages of science
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Bimbisara was the founder of dynasty A Nanda B Haryanka class 6 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
10 examples of evaporation in daily life with explanations
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
How do you graph the function fx 4x class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)