Tautomerism

Q. Which of the following given compounds can exhibit tautomerism ?

1. I and II
2. I , II and III
3. I and III
4. II and III

Q.

What are the conditions for tautomerism?

Q. Which of the following will show tautomerism?

1. 
2. 
3. 
4. 

Q.
The tautomer of $II$ is :

1. $I$
2. $III$
3. Both $I$ and $III$
4. None of the above

Q. Identify 'X' in the following reaction.

1. starch
2. maltose
3. Sucrose
4. lactose

Q. Which of the following structure is the most stable in benzene?

1. 
2. 
3. 
4. (b) and (c) above.

Q. Tautomerism is not exhibited by :

1. 
2. 
3. 
4. 

Q. Among the given compounds, the correct order of enol content is:

1. I > II > III
2. III > II > I
3. II > I > III
4. II > III > I

Q. The alpha carbon in an organic compound refers to the carbon atom directly attached to the functional group, such as a carbonyl group.

1. True
2. False

Q. Which of the following compounds can exhibit tautomerism?

1. A, B, C, D
2. B
3. B, C, D
4. D

Q. In which of the following compounds, keto form is more dominating than enol form?

1. 
2. 
3. 
4. 

Q. Acetyl acetone in enol form is more stable in polar aprotic solvents due to

1. Hydrogen Bonding
2. Aromaticity
3. Hyper-conjugation
4. Polarizability

Q. Which of the following pairs is/are tautomers of each other?

1. 
2. 
3. 
4. 

Q. Among the given compounds, which can exhibit tautomerism ?

1. $I$ only
2. $II$ only
3. $III$ only
4. All of the above

Q.

The enol form of:

1. 

2. 

3. No enol form exits

4. Both a & b

Q. In which of the following compounds tautomerism is possible?

1. 
2. 
3. 
4. 

Q. The most stable keto isomer of the following compound

1. 
2. 
3. 
4. 

Q. Erlenmeyer rule states that all alcohols in which the hydroxyl group is attached directly to a double-bonded carbon atom become .

1. Esters
2. Aldehydes
3. Carboxylic acids
4. Amines

Q. Maximum enolisation takes place in:

1. $C{H}_{3}COC{H}_3$
2. $C{H}_{3}COC{H}_{2}CHO$
3. $C{H}_{3}COC{H}_{2}COC{H}_3$
4. 

Q. The compound(s) which show tautomerism is/are :

1. 
2. 
3. 
4. 

Q. Identify the compound that cannot exhibits tautomerism:

1. 2-butene
2. Lactic acid
3. 2-pentanone
4. Phenol

Q.

The total number of atoms in a body centred cubic unit cell is

1. 1

2. 2

3. 3

4. 4

Q. Which one of the following cannot exist in enolic from?

1. 
2. 
3. 
4. All of the above.

Q.

Number of α-hydrogens in the following compound is .

1. 3
2. 4
3. 5

Q. Among the given ketones, the compound which does not enolize is:

1. $I$ only
2. $II$ only
3. $III$ only
4. All can enolize

Q.

Tautomerism will be exhibited by:

1. $(C{H}_3{)}_{3}CNO$

2. $(C{H}_3{)}_{2}NH$

3. $R_{3}CNO$

4. $RC{H}_{2}N{O}_2$

Q. Which of the following statement(s) is/are correct about tautomers:
I. They possess different electronic and atomic arrangements.
II. They possess different electronic but same atomic arrangements.
III. They have different atomic arrangements but the same electronic arrangements.
IV. They exist in equilibrium.

1. I, IV
2. I, III
3. II, IV
4. II, III

Q.

The most contributing tautomeric enol form of $MeCOC{H}_{2}C{O}_{2}Et$ is?

1. $H_{2}C=C\left(OH\right)C{H}_{2}C{O}_{2}Et$

2. $MeC\left(OH\right)=CHC{O}_{2}Et$

3. 2-Pentanone

4. 2-Butene

Q. Which of the following pairs is/are tautomers of each other?

1. 
2. 
3. 
4. 

Q. For the given compounds:


Here x, y, z represent enol content. The correct order is :

1. x > y > z
2. z > y > x
3. y > x > z
4. x > z > y