Test: Keto-Enol Tautomerism & Related Reactions - NEET MCQ

Among the following compounds, one that will not show keto-enol tautomerism is

Arrange the following in the increasing order of hydrate content at equilibrium in aqueous solution

I. H₂CO

III. C₆H₅CHO

For which of the following equilibrium, K_c < 1 ?

Arrange the following in the increasing order of stability of their most stable enol.

Which of the following observation does not establish the existence of keto-enol tautomerism in acetone?

Hemiacetals are usually unstable whereas acetals are stable. Which has the most stable hemiacetal?

Which form s most stable acetal in the given condition? 

Consider the following reaction,

Q.

The appropriatensequence of reagent that can best bring about the above conversion is

What is the major product in the following reaction?

Which of the following has greater enol content than keto counter part?

Arrange the following in the increasing order of acidic strength 

I. H₂CO
II. CH₃CHO
III. C₆H₅CH₂CHO

One or More than One Options Correct Type

Direction (Q. Nos. 15-19) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q.

Which of the following has (have) more than one enol tautomers?

Which can be deduced correctly regarding keto-enol tautomerism in general?

The correct statement(s) regarding hydrates of aldehyde and ketone is/are

For which of the following equilibrium, K_c is greater than 1?

Consider the reaction below,

The correct statement(s) regarding the above process is/are

Comprehension Type

Direction (Q. Nos. 20-22) This section contains a paragraph, describing theory, experiments, data, etc. Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

In general, ketones are less reactive than aldehydes in nucleophilic addition reaction, for both steric and electronic reasons.
Hence, if a keto-aldehyde is treated with nucleophilic reagent, reaction occur first at aldehyde group.

Q. 

The major final product in the following reaction is

In general, ketones are less reactive than aldehydes in nucleophilic addition reaction, for both steric and electronic reasons.
Hence, if a keto-aldehyde is treated with nucleophilic reagent, reaction occur first at aldehyde group.

Q. 

How the following transformation can be best brought about?

In general, ketones are less reactive than aldehydes in nucleophilic addition reaction, for both steric and electronic reasons.
Hence, if a keto-aldehyde is treated with nucleophilic reagent, reaction occur first at aldehyde group.

Consider the following reaction,

Q. 

Major product is 

One Integer Value Correct Type

Direction (Q. Nos. 23-26) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. 

How many different enols exist for 4-methyl-3- hexanone ?

If all the mono and dienols are considered, how many enols are possible for 2,4-pentanedione?

If butanone is treated with D₂O¹⁸/DCI, isotopic exchange occur. What maximum gain in molecular mass is possible in the present case?

When acetaldehyde is treated with catalytic amount of H₂SO₄, a stable association product X is formed. How many lone pair of electrons are present in XI