Tautomerism

Q. Acetic acid has a pKa of 4.8, ethanol has a pKa of 16.0. What are the major species present, when acetic acid and ethanol are added to water and then the pH is adjusted to 7.0? (a)CH3CO2H & CH3CO2OH (b)CH3CH2O- & CH3CH2OH (c)CH3CO2H & CH3CH2O- (d)CH3CO2- & CH3CH2OH

Q. 21. what is the electronic configuration, bond order and magnetic property of NO

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. Why 4 membered ring is not stable

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

1. 
2. 
3. 
4. 

Q. Which among the given molecules can exhibit tautomerism ?

1. Both I and II
2. Both II and III
3. III only
4. Both I and III

Q. Choose the correct statement related to (I) and (II)

1. (I) has more enol content than (II)
2. (II) has more enol content than (I)
3. Both (I) anf (II) has similar enol content
4. Both (I) and (II) does not exhibit Keto-enol tautomerism

Q.

Which of the following species is not an electrophile?

1. SnCl₄

2. AlBr₃

3. BF₃

4. NH₃

Q. what is the order of stability of benzylic, allylic, 3 degree, 2 degree and 1 degree: i) free radical ii)carbocation

Q.

The compound with more solubility and more basic nature are respectively

1. CsOH, CsOH

2. LiOH, CsOH

3. LiOH, LiOH

4. CsOH, LiOH

Q. Why the inductomeric effect is limited to 3 carbon?

Q.
The number of compounds which undergo tautomerism to form an aromatic product are :

Q. Which of the following has highest % enol content in the liquid?

1. 
2. 
3. 
4. 

Q. How to write the electronic configuration for a given element?

Q. how to find electronic configuration of any given element

Q. Which of the following has the least stable enol form?

1. 
2. 
3. 
4. 

Q. 1. Assertion: Maleic acid shows geometrical isomerism. Reason: it has -C=C- bond.

Q. Huckel's rule states that the hydroxyl group which is attached directly to a double-bonded carbon atom becomes an aldehyde or a ketone.

1. True
2. False

Q. 74. Atoms A, B, C and D are present at corners, face-centres, body-centre and edge-centre respectively in a cubic unit cell. The total number of atoms present per unit cell is

Q. The number of octahedral void(s) per atom present in a cubic-close-packed structure is: (1) 2 (2) 4 (3) 1 (4) 3

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. 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. In N2- there are 15 electrons then which type of eletronic configuration will be used for it.

Q. Tautomerism is exhibited by:

1. $C{H}_{3}CNO$
2. $(C{H}_3{)}_{2}NH$
3. $R_{3}C{O}_{2}H$
4. $RC{H}_{2}N{O}_2$

Q.

Is diazonium salt stable?

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


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

Q. Keto enol tautomerism is not observed in

1. Glycerol
2. Phenol
3. HCN
4. Benzophenone

Q. How many tautomers can you draw for the following ketone?

1. 4
2. 3
3. 2
4. 7

Q. 40.Resonance hybrid of nitrate ion

Q. Difference between methylene and methenyl